the purpose of dreams essay

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Why Your Brain Needs to Dream

We often hear stories of people who’ve learned from their dreams or been inspired by them. Think of Paul McCartney’s story of how his hit song “Yesterday” came to him in a dream or of Mendeleev’s dream-inspired construction of the periodic table of elements.

But, while many of us may feel that our dreams have special meaning or a useful purpose, science has been more skeptical of that claim. Instead of being harbingers of creativity or some kind of message from our unconscious, some scientists have considered dreaming to be an unintended consequence of sleep—a byproduct of evolution without benefit.

Sleep itself is a different story. Scientists have known for a while now that shorter sleep is tied to dangerous diseases, like heart disease and stroke . There is mounting evidence that sleep deprivation leads to a higher risk of obesity and Alzheimer’s disease . Large population studies reflect a saddening truth—the shorter your sleep, the shorter your life . Not only that, sleep helps us to hold onto our memories and to learn facts and skills faster, making it important for everyone including infants, students, athletes, pilots, and doctors.

Much of this I outline in my new book, Why We Sleep: Unlocking the Power of Sleep and Dreams , which summarizes the many findings we have about sleep and its function in our lives.

But what about dreaming? Does it also have a purpose?

Recent work in my neuroscience lab and the work of other scientists has shown that dreams may have a very particular function important to our well-being. Here are the two main ways dreams help us.

Dreaming is like overnight therapy

It’s said that time heals all wounds, but my research suggests that time spent in dream sleep is what heals. REM-sleep dreaming appears to take the painful sting out of difficult, even traumatic, emotional episodes experienced during the day, offering emotional resolution when you awake the next morning.

REM sleep is the only time when our brain is completely devoid of the anxiety-triggering molecule noradrenaline. At the same time, key emotional and memory-related structures of the brain are reactivated during REM sleep as we dream. This means that emotional memory reactivation is occurring in a brain free of a key stress chemical, which allows us to re-process upsetting memories in a safer, calmer environment.

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How do we know this is so? In one study in my sleep center, healthy young adult participants were divided into two groups to watch a set of emotion-inducing images while inside an MRI scanner. Twelve hours later, they were shown the same emotional images—but for half the participants, the twelve hours were in the same day, while for the other half the twelve hours were separated by an evening of sleep.

Those who slept in between the two sessions reported a significant decrease in how emotional they felt in response to seeing those images again, and their MRI scans showed a significant reduction in reactivity in the amygdala, the emotional center of the brain that creates painful feelings. Moreover, there was a reengagement of the rational prefrontal cortex of the brain after sleep that helped maintain a dampening influence on emotional reactivity. In contrast, those who remained awake across the day showed no such dissolving of emotional reactivity over time.

That in itself doesn’t say anything about the role of dreaming. But we had recorded each participant’s sleep during the intervening night between the two test sessions, and we found that specific brain activity that reflected a drop in stress-related brain chemistry during the dream state determined the success of overnight therapy from one individual to the next.

Dreaming has the potential to help people de-escalate emotional reactivity, probably because the emotional content of dreams is paired with a decrease in brain noradrenaline. Support for this idea came from a study done by Murray Raskind on vets with PTSD, who often suffer debilitating nightmares. When given the drug Prazosin—a medication that lowers blood pressure and also acts as a blocker of the brain stress chemical noradrenaline—the vets in his study had fewer nightmares and fewer PTSD symptoms than those given a placebo. Newer studies suggest this effect can be shown in children and adolescents with nightmares, as well, though the research on this is still in its infancy.

The evidence points toward an important function of dreams: to help us take the sting out of our painful emotional experiences during the hours we are asleep, so that we can learn from them and carry on with our lives.

Dreaming enhances creativity and problem-solving

It’s been shown that deep non-REM sleep strengthens individual memories. But REM sleep is when those memories can be fused and blended together in abstract and highly novel ways. During the dreaming state, your brain will cogitate vast swaths of acquired knowledge and then extract overarching rules and commonalties, creating a mindset that can help us divine solutions to previously impenetrable problems.

How do we know dreaming and not just sleep is important to this process?

In one study , we tested this by waking up participants during the night—during both non-REM sleep and dreaming sleep—and gave them very short tests: solving anagram puzzles, where you try to unscramble letters to form a word (e.g., OSEOG = GOOSE). First, participants were tested beforehand, just to familiarize them with the test. Then, we monitored their sleep and woke them up at different points of the night to perform the test. When woken during non-REM sleep, they were not particularly creative—they could solve very few puzzles. But, when we woke up participants during REM sleep, they were able to solve 15-35 percent more puzzles than when they were awake. Not only that, participants woken while dreaming reported that the solution just “popped” into their heads, as if it were effortless.

In another study , I and my colleagues taught participants a series of relational facts—such as, A>B, B>C, C>D, and so on—and tested their understanding by asking them questions (e.g., Is B>D or not? ). Afterwards, we compared their performance on this test before and after a full night’s sleep, and also after they’d had a 60- to 90-minute nap that included REM sleep. Those who’d slept or had a long nap performed much better on this test than when they were awake, as if they’d put together disparate pieces of a jigsaw puzzle in their sleep.

Some may consider this trivial, but it is one of the key operations differentiating your brain from your computer. It also underlies the difference between knowledge (retention of individual facts) and wisdom (knowing what they all mean when you fit them together). The latter seems to be the work of REM-sleep dreaming.

“It’s said that time heals all wounds, but my research suggests that time spent in dream sleep is what heals”

Dreaming improves creative problem solving, too, according to another study . Participants learned to navigate a virtual maze using trial and error and aided by the placement of unique objects—like Christmas trees—at certain junctions in the maze. After this learning session, the group was split in two, with half napping and half watching a video for 90 minutes. Nappers were occasionally awoken to ask about the content of their dreams; those watching a video were also asked about thoughts going through their minds.

Afterwards, the participants again tried to solve the maze, and those who napped were significantly better at it than those who didn’t, as expected. But the nappers who reported dreaming about the maze were 10 times better at the task than those who napped and didn’t dream about the maze. There’s a reason you’ve never been told to stay awake on a problem.

Looking at the content of these dreams, it was clear that the participants didn’t dream a precise replay of the learning experience while awake. Instead, they were cherry-picking salient fragments of the learning experience and attempting to place them within the catalog of preexisting knowledge. This is how dreaming helps us be more creative.

While the benefits of dreaming are real, too many of us have problems getting a full eight hours of sleep and lose out on these advantages. Alternatively, we may think we’re the exception to the rule—that we’re one of those people who doesn’t happen to need a lot of sleep. But nothing could be further from the truth. Research clearly shows that people who overestimate their ability to get by on less sleep are sadly wrong.

Five ways to enhance your sleep

So how can we be sure to get enough sleep and experience a dream state? While we may be tempted to use sleeping pills to get to sleep, this has been shown to be detrimental to dreaming. Instead of taking pills, here are some simple ways to enhance your sleep:

1. Make sure your room is dark and that you are not looking at bright light sources—i.e., computer screens and cell phones—in the last hour or two before going to bed. You may even want to start dimming lights in your house in the earlier parts of the evening, which helps to stimulate sleepiness.

2. Go to bed and wake up at approximately the same time every day. This helps signal to your body a regular time for sleeping. It’s no use trying to sleep in a lot on weekends. There is no way to make up for regular sleep loss during the week.

3. Keep the temperature in your house cool at night—maybe even cooler than you think it should be, like around 65 degrees. Your body temperature needs to drop at night for sleep, and a lower room temperature helps signal your brain that it’s time to sleep.

4. If you have trouble falling asleep, or wake in the night feeling restless, don’t stay in bed awake. That trains the brain that your bed is not a place for sleeping. Instead, get up and read a book under dim light in a different room. Don’t look at your computer or cell phone. When sleepiness returns, then go back to bed. Or if you don’t want to get out of bed, try meditating. Studies suggest it helps individuals fall asleep faster, and also improves sleep quality.

5. Don’t have caffeine late in the day or an alcohol-infused nightcap. Both of these interfere with sleep—either keeping you awake or stimulating frequent wake-ups during the night.

Sleep is the single most effective thing we can do to rest our brain and physical health each day. Atop of sleep, dreaming provides essential emotional first aid and a unique form of informational alchemy. If we wish to be as healthy, happy, and creative as possible, these are facts well worth waking up to.

About the Author

Matthew Walker

Matthew Walker is a professor of psychology and neuroscience at the University of California, Berkeley, and the director of the university’s Center for Human Sleep Science .

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Essays About Dreams In Life: 14 Examples And Topic Ideas

Dreams in life are necessary; if you are writing essays about dreams in life, you can read these essay examples and topic ideas to get started.

Everyone has a dream – a big one or even a small one. Even the most successful people had dreams before becoming who they are today. Having a dream is like having a purpose in life; you will start working hard to reach your dream and never lose interest in life.

Without hard work, you can never turn a dream into a reality; it will only remain a desire. Level up your essay writing skills by reading our essays about dreams in life examples and prompts and start writing an inspiring essay today!

Writing About Dreams: A Guide

Essays about dreams in life: example essays, 1. chase your dreams: the best advice i ever got by michelle colon-johnson, 2. my dream, my future by deborah massey, 3. the pursuit of dreams by christine nishiyama, 4. my dreams and ambitions by kathy benson, 5. turning big dreams into reality by shyam gokarn, 6. my hopes and dreams by celia robinson, 7. always pursue your dreams – no matter what happens by steve bloom, 8. why do we dream by james roland, 9. bad dreams by eli goldstone, 10. why your brain needs to dream by matthew walker, 11. dreams by hedy marks, 12. do dreams really mean anything by david b. feldman, 13. how to control your dreams by serena alagappan, 14. the sunday essay: my dreams on antidepressants by ashleigh young, essays about dreams in life essay topics, 1. what is a dream, 2. what are your dreams in life, 3. why are dreams important in life, 4. what are the reasons for a person to dream big, 5. what do you think about dreams in life vs. short-term sacrifice, 6. what is the purpose of dreaming, 7. why are dreams so strange and vivid, 8. why do dreams feel so real, 9. why are dreams so hard to remember, 10. do dreams mean anything, what is a dream short essay, how can i write my dream in life.

Writing about dreams is an excellent topic for essays, brainstorming new topic ideas for fiction stories, or just as a creative outlet. We all have dreams, whether in our sleep, during the day, or even while walking on a sunny day. Some of the best ways to begin writing about a topic are by reading examples and using a helpful prompt to get started. Check out our guide to writing about dreams and begin mastering the art of writing today!

“Everyone has the ability to dream, but not everyone has the willingness to truly chase their dreams. When people aren’t living their dreams they often have limited belief systems. They believe that their current circumstances and/or surroundings are keeping them from achieving the things they want to do in life.”

In her essay, author Michelle Colon-Johnson encourages her readers to develop a mindset that will let them chase their dreams. So, you have to visualize your dream, manifest it, and start your journey towards it! Check out these essays about dreams and sleep .

“At the time when I have my job and something to make them feel so proud of me, I would like to give them the best life. I would like to make them feel comfortable and see sweet smiles on their faces. This is really the one I like to achieve in my life; mountains of words can’t explain how much I love and appreciate them.”

Author Deborah Massey’s essay talks about her dreams and everything she wanted to achieve and accomplish in her life. She also tells us that we must live our values, pursue our dreams, and follow our passions for the best future.

“Fast-forward 5+ years, and my first published book is coming out this May with Scholastic. And now, let me tell you the truth: I don’t feel any different. I’m extremely grateful for the opportunity, proud of the work I’ve done, and excited for the book’s release. But on a fundamental level, I feel the same.”

In her essay, author Christine Nishiyama shares what she felt when she first achieved one of her goals in life. She says that with this mindset, you will never feel the satisfaction of achieving your goal or the fulfillment of reaching your dream. Instead, she believes that what fulfills people is the pursuit of their dreams in life.

“My dream is to become a good plastic surgeon and day after day it has transformed into an ambition which I want to move towards. I do not want to be famous, but just good enough to have my own clinic and work for a very successful hospital. Many people think that becoming a doctor is difficult, and I know that takes many years of preparation, but anyone can achieve it if they have determination.”

Author Kathy Benson’s essay narrates her life – all the things and struggles she has been through in pursuing her dreams in life. Yet, no matter how hard the situation gets, she always convinces herself not to give up, hoping her dreams will come true one day. She believes that with determination and commitment, anyone can achieve their dreams and goals in life. 

“I have always been a big dreamer and involved in acting upon it. Though, many times I failed, I continued to dream big and act. As long as I recollect, I always had such wild visions and fantasies of thinking, planning, and acting to achieve great things in life. But, as anyone can observe, there are many people, who think and work in that aspect.”

In his essay, author Shyam Gokarn explains why having a big dream is very important in a person’s life. However, he believes that the problem with some people is that they never hold tight to their dreams, even if they can turn them into reality. As a result, they tend to easily give up on their dreams and even stop trying instead of persevering through the pain and anguish of another failure.

“When I was younger, I’ve always had a fairytale-like dream about my future. To marry my prince, have a Fairy Godmother, be a princess… But now, all of that has changed. I’ve realized how hard life is now; that life cannot be like a fairy tale. What you want can’t happen just like that.”

Celia Robinson’s essay talks about her dream since she was a child. Unfortunately, as we grow old, there’s no “Fairy Godmother” that would help us when things get tough. Everyone wants to succeed in the future, but we have to work hard to achieve our dreams and goals.

“Take writing for example. I’ve wanted to be a professional writer since I was a little boy, but I was too scared that I wouldn’t be any good at it. But several years ago I started pursuing this dream despite knowing how difficult it might be. I fully realize I may not make it, but I’m completely fine with that. At least I tried which is more than most people can say.”

In his essay, author Steve Bloom encourages his readers always to pursue their dreams no matter what happens. He asks, “Would you rather pursue them and fail or never try?”. He believes that it’s always better to try and fail than look back and wonder what might have been. Stop thinking that failure or success is the only end goal for pursuing your dreams. Instead, think of it as a long journey where all the experiences you get along the way are just as important as reaching the end goal.

“Dreams are hallucinations that occur during certain stages of sleep. They’re strongest during REM sleep, or the rapid eye movement stage, when you may be less likely to recall your dream. Much is known about the role of sleep in regulating our metabolism, blood pressure, brain function, and other aspects of health. But it’s been harder for researchers to explain the role of dreams. When you’re awake, your thoughts have a certain logic to them. When you sleep, your brain is still active, but your thoughts or dreams often make little or no sense.”

Author James Roland’s essay explains the purpose of having dreams and the factors that can influence our dreams. He also mentioned some of the reasons that cause nightmares. Debra Sullivan, a nurse educator, medically reviews his essay. Sullivan’s expertise includes cardiology, psoriasis/dermatology, pediatrics, and alternative medicine. For more, you can also see these articles about sleep .

“The first time I experienced sleep paralysis and recognised it for what it was I was a student. I had been taking MDMA and listening to Django Reinhardt. My memories of that time are mainly of taking drugs and listening to Django Reinhardt. When I woke up I was in my paralysed body. I was there, inside it. I was inside my leaden wrists, my ribcage, the thick dead roots of my hair, the bandages of skin. This time the hallucinations were auditory. I could hear someone being beaten outside my door. They were screaming for help. And I could do nothing but lie there, locked inside my body . . . whatever bit of me is not my body. That is the bit that exists, by itself, at night.”

In her essay, Author Eli Goldstone talks about her suffering from bad dreams ever since childhood. She also talks about what she feels every time she has sleep paralysis – a feeling of being conscious but unable to move.

“We often hear stories of people who’ve learned from their dreams or been inspired by them. Think of Paul McCartney’s story of how his hit song “Yesterday” came to him in a dream or of Mendeleev’s dream-inspired construction of the periodic table of elements. But, while many of us may feel that our dreams have special meaning or a useful purpose, science has been more skeptical of that claim. Instead of being harbingers of creativity or some kind of message from our unconscious, some scientists have considered dreaming to being an unintended consequence of sleep—a byproduct of evolution without benefit.”

Author Matthew Walker, a professor of psychology and neuroscience, shares some interesting facts about dreams in his essay. According to research, dreaming is more than just a byproduct of sleep; it also serves essential functions in our well-being. 

“Dreams are basically stories and images that our mind creates while we sleep. They can be vivid. They can make you feel happy, sad, or scared. And they may seem confusing or perfectly rational. Dreams can happen at any time during sleep. But you have your most vivid dreams during a phase called REM (rapid eye movement) sleep, when your brain is most active. Some experts say we dream at least four to six times a night.”

In his essay, Author Hedy Marks discusses everything we need to know about dreams in detail – from defining a dream to tips that may help us remember our dreams. Hedy Marks is an Assistant Managing Editor at WebMD , and Carol DerSarkissian, a board-certified emergency physician, medically reviews his essay.

“Regardless of whether dreams foretell the future, allow us to commune with the divine, or simply provide a better understanding of ourselves, the process of analyzing them has always been highly symbolic. To understand the meaning of dreams, we must interpret them as if they were written in a secret code. A quick search of an online dream dictionary will tell you that haunted houses symbolize “unfinished emotional business,” dimly lit lamps mean you’re “feeling overwhelmed by emotional issues,” a feast indicates “a lack of balance in your life,” and garages symbolize a feeling of “lacking direction or guidance in achieving your goals.” 

Author David B. Feldman, an author, speaker, and professor of counseling psychology, believes that dreams may not mean anything, but they tell us something about our emotions. In other words, if you’ve been suffering from a series of bad dreams, it could be worth checking in with yourself to see how you’ve been feeling and perhaps consider whether there’s anything you can do to improve your mood.

“Ever wish you could ice skate across a winter sky, catching crumbs of gingerbread, like flakes of snow, on your tongue? How about conquering a monster in a nightmare, bouncing between mountain peaks, walking through walls, or reading minds? Have you ever longed to hold the hand of someone you loved and lost? If you want to fulfill your fantasies, or even face your fears, you might want to try taking some control of your dreams (try being the operative). People practiced in lucid dreaming—the phenomenon of being aware that you are dreaming while you are asleep—claim that the experience allows adventure, self-discovery, and euphoric joy.”

In her essay, Author Serena Alagappan talks about lucid dreams – a type of dream where a person becomes conscious during a dream. She also talked about ways to control our dreams, such as keeping a journal, reciting mantras before bed, and believing we can. However, not everyone will be able to control their dreams because the levels of lucidity and control differ significantly between individuals.

“There was a period of six months when I tried to go off my medication – a slowly unfolding disaster – and I’d thought my dreams might settle down. Instead, they grew more deranged. Even now I think of the dream in which I was using a cigarette lighter to melt my own father, who had assumed the form of a large candle. I’ve since learned that, apart from more research being needed, this was probably a case of “REM rebound”. When you stop taking the medication, you’ll likely get a lot more REM sleep than you were getting before. In simple terms, your brain goes on a dreaming frenzy, amping up the detail.”

Author Ashleigh Young’s essay informs us how some medications, such as antidepressants, affect our dreams based on her own life experience. She said, “I’ve tried not to dwell too much on my dreams. Yes, they are vivid and sometimes truly gruesome, full of chaotic, unfathomable violence, but weird nights seemed a reasonable price to pay for the bearable days that SSRIs have helped me to have.” 

In simple terms, a dream is a cherished aspiration, ambition, or ideal; is it the same as your goal in life? In your essay, explore this topic and state your opinion about what the word “dream” means to you.

This is an excellent topic for your statement or “about me” essay. Where do you see yourself in the next ten years? Do you have a career plan? If you still haven’t thought about it, maybe it’s time to start thinking about your future.

Having dreams is very important in a person’s life; it motivates, inspires, and helps you achieve any goal that you have in mind. Without dreams, we would feel lost – having no purpose in life. Therefore, in your essay, you should be able to explain to your readers how important it is to have a dream or ambition in life. 

Dreaming big sounds great; however, it’s easier said than done. First, you’ve got to have reasons to dream big, which will motivate you to achieve your goals in life. If you’re writing an essay about dreams in life, mention why most people dare to dream big and achieve more in life. Is it about freedom, money, praise from other people, satisfaction, or something else entirely?

For example, you could watch movies, play video games, relax every night, or give up all of them to learn a complex skill – what would you choose, and why? In your essay about dreams in life, answer the question and include other examples about this topic so your readers can relate.

There are many answers to this question – one is that dreams may have an evolutionary function, testing us in scenarios crucial to our survival. Dreams may also reduce the severity of emotional trauma. On the other hand, some researchers say dreams have no purpose or meaning, while some say we need dreams for physical and mental health. Take a closer look at this topic, and include what you find in your essay.

Weird dreams could result from anxiety, stress, or sleep deprivation. So, manage your stress levels, and stick to a sleep routine to stop having weird dreams. If you wake up from a weird dream, you can fall back asleep using deep breaths or any relaxing activity. You can research other causes of weird dreams and ways to stop yourself from having them for your essay about dreams and sleep.

The same areas of the brain that are active when we learn and process information in the actual world are active when we dream, and they replay the information as we sleep. Many things we see, hear, and feel in our everyday lives appear in our dreams. If you want to write an informative essay about dreams and sleep, look into more details about this topic.

Tip: When editing for grammar, we also recommend taking the time to improve the readability score of a piece of writing before publishing or submitting it.

People may not remember what happened in their dreams. Studies show that people tend to forget their dreams due to the changing levels of acetylcholine and norepinephrine during sleep. This will be quite an exciting topic for your readers because many people can relate. That being said, research more information about this topic, and discuss it in detail in your essay. 

Although some people believe that dreams don’t mean anything, many psychologists and other experts have theorized about the deeper meaning of dreams. Therefore, your essay about dreams and sleep should delve deeper into this topic. If you’re stuck picking your next essay topic, check out our round-up of essay topics about education .

FAQS on Essays About Dreams in Life

There are many great short essays about dreams; you can write your own too! Some great examples include Do Dreams Really Mean Anything? by David B. Feldman and  Dreams by Hedy Marks.

Writing about your dreams in life is a fantastic creative outlet and can even help you plan your future. Use a prompt to get started, like “What are your dreams in life?” or “What do you aspire to be in ten years?” and begin writing without thinking too much about it. See where the pen takes you and start mapping out your future with this writing exercise.

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Why Do We Dream?

There's no single consensus about which dream theory best explains why we dream

Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

Dr. Sabrina Romanoff, PsyD, is a licensed clinical psychologist and a professor at Yeshiva University’s clinical psychology doctoral program.

Verywell / Madelyn Goodnight

What Is a Dream Theory?

• The Role of Dreams
• Reflect the Unconscious
• Process Information
• Aid In Memory
• Spur Creativity
• Reflect Your Life
• Prepare and Protect
• Process Emotions
• Other Theories

Lucid Dreaming

Stress dreams.

A dream theory is a proposed explanation for why people dream that is backed by scientific evidence. Despite scientific inquiry, we still don't have a solid answer for why people dream. Some of the most notable theories are that dreaming helps us process memories and better understand our emotions , also providing a way to express what we want or to practice facing our challenges.

At a Glance

There is no single dream theory that fully explains all of the aspects of why we dream. The most prominent theory is that dreams help us to process and consolidate information from the previous day. However, other theories have suggested that dreams are critical for emotional processing, creativity, and self-knowledge.

Some theories suggest that dreams also have symbolic meanings that offer a glimpse into the unconscious mind. Keep reading to learn more about some of the best-known theories about why we dream.

7 Theories on Why We Dream

A dream theory focuses on understanding the nature and purpose of dreams. Studying dreams can be challenging since they can vary greatly in how they are remembered and what they are about.

Dreams include the images, thoughts, and emotions that are experienced during sleep. They can range from extraordinarily intense or emotional to very vague, fleeting, confusing, or even boring.

Some dreams are joyful, while others are frightening or sad. Sometimes dreams seem to have a clear narrative, while many others appear to make no sense at all.

There are many unknowns about dreaming and sleep, but what scientists do know is that just about everyone dreams every time they sleep, for a total of around two hours per night, whether they remember it upon waking or not .

Beyond what's in a particular dream, there is the question of why we dream at all. Below, we detail the most prominent theories on the purpose of dreaming and how these explanations can be applied to specific dreams.

How Do Scientists Study Dreams?

The question of why we dream has fascinated philosophers and scientists for thousands of years. Traditionally, dream content is measured by the subjective recollections of the dreamer upon waking. However, observation is also accomplished through objective evaluation in a lab.

In one study, researchers even created a rudimentary dream content map that was able to track what people dreamed about in real time using magnetic resonance imaging (MRI) patterns. The map was then backed up by the dreamers' reports upon waking.

What Dream Theory Suggests About the Role of Dreams

Some of the more prominent dream theories suggest that the reason we dream is to:

• Consolidate memories
• Process emotions
• Express our deepest desires
• Gain practice confronting potential dangers

Many experts believe that we dream due to a combination of these reasons rather than any one particular theory. Additionally, while many researchers believe that dreaming is essential to mental, emotional, and physical well-being, some scientists suggest that dreams serve no real purpose at all.

The bottom line is that while many theories have been proposed, no single consensus has emerged about which dream theory best explains why we dream.

Dreaming during different phases of sleep may also serve unique purposes. The most vivid dreams happen during rapid eye movement (REM) sleep , and these are the dreams that we're most likely to recall. We also dream during non-rapid eye movement (non-REM) sleep, but those dreams are known to be remembered less often and have more mundane content.

Sigmund Freud's Dream Theory

Sigmund Freud’s theory of dreams suggests that dreams represent  unconscious desires, thoughts, wish fulfillment, and motivations. According to Freud, people are driven by repressed and unconscious longings, such as aggressive and sexual instincts .

While many of Freud's assertions have been debunked, research suggests there is a dream rebound effect, also known as dream rebound theory, in which suppression of a thought tends to result in dreaming about it.

What Causes Dreams to Happen?

In " The Interpretation of Dreams ," Freud wrote that dreams are "disguised fulfillments of repressed wishes." He also described two different components of dreams: manifest content (actual images) and latent content (hidden meaning).

Freud’s theory contributed to the rise and popularity of dream interpretation . While research has failed to demonstrate that the manifest content disguises the psychological significance of a dream, some experts believe that dreams play an important role in processing emotions and stressful experiences.

Activation-Synthesis Dream Theory

According to the activation-synthesis model of dreaming , which was first proposed by J. Allan Hobson and Robert McCarley, circuits in the brain become activated during REM sleep, which triggers the amygdala and hippocampus to create an array of electrical impulses. This results in a compilation of random thoughts, images, and memories that appear while dreaming.

When we wake, our active minds pull together the dream's various images and memory fragments to create a cohesive narrative.  

In the activation-synthesis hypothesis, dreams are a compilation of randomness that appear to the sleeping mind and are brought together in a meaningful way when we wake. In this sense, dreams may provoke the dreamer to make new connections, inspire useful ideas, or have creative epiphanies in their waking lives.

Self-Organization Dream Theory

According to the information-processing theory, sleep allows us to consolidate and process all of the information and memories that we have collected during the previous day. Some dream experts suggest that dreaming is a byproduct, or even an active part, of this experience processing.  

This model, known as the self-organization theory of dreaming , explains that dreaming is a side effect of brain neural activity as memories are consolidated during sleep.

During this process of unconscious information redistribution, it is suggested that memories are either strengthened or weakened. According to the self-organization theory of dreaming, while we dream, helpful memories are made stronger, while less useful ones fade away.

Research supports this theory, finding improvement in complex tasks when a person dreams about doing them. Studies also show that during REM sleep, low-frequency theta waves were more active in the frontal lobe, just like they are when people are learning, storing, and remembering information when awake.

Creativity and Problem-Solving Dream Theory

Another theory about dreams says that their purpose is to help us solve problems. In this creativity theory of dreaming, the unconstrained, unconscious mind is free to wander its limitless potential while unburdened by the often stifling realities of the conscious world. In fact, research has shown dreaming to be an effective promoter of creative thinking.

Scientific research and anecdotal evidence back up the fact that many people do successfully mine their dreams for inspiration and credit their dreams for their big "aha" moments.

The ability to make unexpected connections between memories and ideas that appear in your dreams often proves to be an especially fertile ground for creativity.

Continuity Hypothesis Dream Theory

Under the continuity hypothesis, dreams function as a reflection of a person's real life, incorporating conscious experiences into their dreams. Rather than a straightforward replay of waking life, dreams show up as a patchwork of memory fragments.

Still, studies show that non-REM sleep may be more involved with declarative memory (the more routine stuff), while REM dreams include more emotional and instructive memories.

In general, REM dreams tend to be easier to recall compared to non-REM dreams.

Under the continuity hypothesis, memories may be fragmented purposefully in our dreams as part of incorporating new learning and experiences into long-term memory . Still, there are many unanswered questions as to why some aspects of memories are featured more or less prominently in our dreams.

Rehearsal and Adaptation Dream Theory

The primitive instinct rehearsal and adaptive strategy theories of dreaming propose that we dream to better prepare ourselves to confront dangers in the real world. The dream as a social simulation function or threat simulation provides the dreamer a safe environment to practice important survival skills.

While dreaming, we hone our fight-or-flight instincts and build mental capability for handling threatening scenarios. Under the threat simulation theory, our sleeping brains focus on the fight-or-flight mechanism to prep us for life-threatening and/or emotionally intense scenarios including:

• Running away from a pursuer
• Falling over a cliff
• Showing up somewhere naked
• Going to the bathroom in public
• Forgetting to study for a final exam

This theory suggests that practicing or rehearsing these skills in our dreams gives us an evolutionary advantage in that we can better cope with or avoid threatening scenarios in the real world. This helps explain why so many dreams contain scary, dramatic, or intense content.

Emotional Regulation Dream Theory

The emotional regulation dream theory says that the function of dreams is to help us process and cope with our emotions or trauma in the safe space of slumber.

Research shows that the amygdala , which is involved in processing emotions, and the hippocampus , which plays a vital role in condensing information and moving it from short-term to long-term memory storage, are active during vivid, intense dreaming.

This illustrates a strong link between dreaming, memory storage, and emotional processing.

This theory suggests that REM sleep plays a vital role in emotional brain regulation. It also helps explain why so many dreams are emotionally vivid and why emotional or traumatic experiences tend to show up on repeat. Research has shown a connection between the ability to process emotions and the amount of REM sleep a person gets.

Sharing Dreams Promotes Connection

Talking about content similarities and common dreams with others may help promote belongingness and connection. Research notes heightened empathy among people who share their dreams with others, pointing to another way dreams can help us cope by promoting community and interpersonal support.

Other Theories About Why We Dream

Many other theories have been suggested to account for why we dream.

• One dream theory contends that dreams are the result of our brains trying to interpret external stimuli (such as a dog's bark, music, or a baby's cry) during sleep.
• Another theory uses a computer metaphor to account for dreams, noting that dreams serve to "clean up" clutter from the mind, refreshing the brain for the next day.
• The reverse-learning theory suggests that we dream to forget. Our brains have thousands of neural connections between memories—too many to remember them all—and that dreaming is part of "pruning" those connections.
• In the continual-activation theory, we dream to keep the brain active while we sleep, in order to keep it functioning properly.

Overfitted Dream Hypothesis

One recently introduced dream theory, known as the overfitted dream hypothesis, suggests that dreams are the brain's way of introducing random, disruptive data to help break up repetitive daily tasks and information. Researcher Erik Hoel suggests that such disruptions helps to keep the brain fit.

Lucid dreams are relatively rare dreams where the dreamer has awareness of being in their dream and often has some control over the dream content. Research indicates that around 50% of people recall having had at least one lucid dream in their lifetime and just over 10% report having them two or more times per month.

It is unknown why certain people experience lucid dreams more frequently than others. While experts are unclear as to why or how lucid dreaming occurs, preliminary research signals that the prefrontal and parietal regions of the brain play a significant role.

How to Lucid Dream

Many people covet lucid dreaming and seek to experience it more often. Lucid dreaming has been compared to virtual reality and hyper-realistic video games, giving lucid dreamers the ultimate self-directed dreamscape experience.

Potential training methods for inducing lucid dreaming include cognitive training, external stimulation during sleep, and medications. While these methods may show some promise, none have been rigorously tested or shown to be effective.

A strong link has been found between lucid dreaming and highly imaginative thinking and creative output. Research has shown that lucid dreamers perform better on creative tasks than those who do not experience lucid dreaming.

Stressful experiences tend to show up with great frequency in our dreams. Stress dreams may be described as sad, scary, and nightmarish .

Experts do not fully understand how or why specific stressful content ends up in our dreams, but many point to a variety of theories, including the continuity hypothesis, adaptive strategy, and emotional regulation dream theories to explain these occurrences. Stress dreams and mental health seem to go hand-in-hand.

• Daily stress shows up in dreams : Research has shown that those who experience greater levels of worry in their waking lives and people diagnosed with post-traumatic stress disorder (PTSD) report higher frequency and intensity of nightmares.
• Mental health disorders may contribute to stress dreams : Those with mental health disorders such as anxiety, bipolar disorder , and depression tend to have more distressing dreams, as well as more difficulty sleeping in general.
• Anxiety is linked to stress dreams : Research indicates a strong connection between anxiety and stressful dream content. These dreams may be the brain's attempt to help us cope with and make sense of these stressful experiences.

While many theories exist about why we dream, more research is needed to fully understand their purpose. Rather than assuming only one dream theory is correct, dreams likely serve various purposes. In reality, many of these dream theories may be useful for explaining different aspects of the dreaming process.

If you are concerned about your dreams and/or are having frequent nightmares , consider speaking to your doctor or consulting a sleep specialist.

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By Kendra Cherry, MSEd Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

December 12, 2023

Why Do We Dream? Maybe to Ensure We Can Literally ‘See’ the World upon Awakening

A theory holds that dreams are a way for the visual cortex of the brain to “defend its turf” against being “taken over” to process inputs from other senses

By Roberta McLain

Visual pathway and cortex.

janulla/Getty Images

Dreams have fascinated people for millennia, yet we struggle to understand their purpose. Some theories suggest dreams help us deal with emotions, solve problems or manage hidden desires. Others postulate that they clean up brain waste, make memories stronger or deduce the meaning of random brain activity. A more recent theory suggests nighttime dreams protect visual areas of the brain from being co-opted during sleep by other sensory functions, such as hearing or touch.

David Eagleman, a neuroscientist at Stanford University, has proposed the idea that dreaming is necessary to safeguard the visual cortex—the part of the brain responsible for processing vision. Eagleman’s theory takes into account that the human brain is highly adaptive, with certain areas able to take on new tasks, an ability called neuroplasticity. He argues that neurons compete for survival. The brain, Eagleman explains, distributes its resources by “implementing a do-or-die competition” for brain territory in which sensory areas “gain or lose neural territory when inputs slow, stop or shift.” Experiences over a lifetime reshape the map of the brain. “Just like neighboring nations, neurons stake out their territory and chronically defend them,” he says.

Eagleman points to children who have had half their brain removed because of severe health problems and then regain normal function. The remaining brain reorganizes itself and takes over the roles of the missing sections. Similarly, people who lose sight or hearing show heightened sensitivity in the remaining senses because the region of the brain normally used by the lost sense is taken over by other senses.

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Reorganization can happen fast. Studies published in 2007 and 2008 by Lotfi Merabet of Harvard Medical School and his colleagues showed just how quickly this takeover can happen. The 2008 study, in which subjects were blindfolded, revealed that the seizing of an idle area by other senses begins in as little as 90 minutes. And other studies found that this can occur within 45 minutes.

When we sleep, we can smell, hear and feel, but visual information is absent—except during REM sleep. About 90 minutes after drifting off to sleep, you enter REM. It begins when neurons in your brain stem, the stalklike section at the bottom of the organ, signal the beginning of two important tasks. Activity of these neurons, for one, paralyze major muscles, preventing the sleeper from acting out what is happening in the dream. Also, these brain cells send messages directly to the visual cortex, which initiates the dreaming process.

Why does REM follow that timetable? It conforms to when the visual cortex needs to start defending its territory, Eagleman argues. Scans of dreaming people show most of the brain activity associated with REM is within the visual cortex. Dreams are the brain’s way of fighting takeover from other senses, according to Eagleman, and REM activation prompts internally generated activity in the visual cortex as a means to safeguard its territory. As long as the neurons in the visual cortex are actively performing their customary job—in this case, generating visual imagery—they will not be commandeered by nearby neurons that process other sensory information.

Eagleman argues that the more plastic the brain, the more REM sleep is necessary to mount a defense. For babies to develop properly, they must sleep a lot, spending almost 50 percent of their time in REM sleep. But as people age, their brain becomes less flexible. (Think of how easily children learn languages, compared with adults.) At the same time, adults spend less time in REM sleep.

The correlation between adaptability and REM seems to hold across species. According to Eagleman, “Mother Nature drops human brains into the world half-baked and lets experience take over and shape them.” He argues the less hardwired a species’ brain is at birth, the more ability it has to adapt and learn from experience. But this has its disadvantages. For example, fawns and calves are able to walk within hours of birth because the behavior is hardwired. Human babies, with their more adaptable brains, require significantly more REM sleep than animals born with more hardwired brains.

Some researchers—in particular, dream researchers—disagree with Eagleman’s hypothesis. One example that raises doubts is the fact that the blind mole rat does not see and still experiences REM sleep. Yet some evolutionary adaptations are vestigial remnants of traits that were useful in the past but have become less significant as animals have evolved. So perhaps there was no pressure for blind mole rats to lose REM activity as they evolved without vision.

Antonio Zadra, a dream researcher at the University of Montreal, claims Eagleman’s theory “has little to do with actual dreaming and explains almost nothing about dreams per se, as opposed to REM sleep.” He asserts the theory “is, for me and many others who actually work in the field, silly and overly reductionistic and simplistic.”

Deirdre Leigh Barrett, a psychologist at Harvard University, former president of the International Association for the Study of Dreams and author of The Committee of Sleep , however, is more willing to consider Eagleman’s hypothesis. “It’s very convincing that there's a correlation between smarter animals and more elaborate brains,” she says. As far as dreams defending brain real estate, “I have a little more trouble with the visual argument, but it’s interesting.”

Eagleman says that his theory can accommodate other explanations for dreams and that REM sleep may serve many purposes besides protecting the visual cortex. Think of dreaming like a computer screen saver that is set to go off every 90 minutes—except that instead of protecting against frozen images, dreams prevent the visual cortex from being usurped by other functions. These visual hallucinations in the night may let us see during the day.