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What is REM Sleep?

What is REM Sleep?

Tara Youngblood · Mar 29, 2022
What is REM Sleep?

No matter who we are, where we live, or what our professions, it’s safe to say that we all agree on one thing: We need our sleep.

But Why?

One of the main reasons is a complex set of neurological processes called REM sleep. This stands for Rapid Eye Movement.

Without REM sleep, we simply cannot function successfully during waking hours. We become more irritable, groggy, and fatigued. Furthermore, we experience decreased concentration, memory, and cognition.

Table of Contents:

Read on to gain a practical and research-based understanding of:

What is REM Sleep?

It was first described by sleep researcher Nathaniel Kleitman in 1953. Since then, an expansive amount of research has been conducted in pursuit of answers to the mysteries of sleep.

As the term “rapid eye movement” suggests, the eyes tend to dart back and forth in different directions under closed eyelids. This is when dreams most often occur. Although it might seem those eye movements are due to the scanning of dream images, this has not been definitively proven. [1] Other names for REM include active sleep, desynchronized sleep, and paradoxical sleep.[2]

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REM vs. Non-REM Sleep

Decades of in-depth research have revealed two broad categories of sleep: Non-REM and REM sleep. [3]

Non-REM Sleep

Non-REM typically encompasses the first three stages of sleep, from light sleep to deep sleep. It’s during the deep sleep stage that the body builds bone and muscle, as well as strengthens the immune system.[4]

REM Sleep

REM is the final stage of the alternating non-REM/REM sleep cycle. Typically, humans cycle through between three and five REM stages per night.

A common question asked is how long is REM cycle? Usually, REM sleep occurs within 90 minutes after falling asleep. The first stage lasts only about 10 minutes, while each of the later REM stages gets longer, and the last stage can last up to an hour. 

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Clinical Signs of REM Sleep

Upon entry, incredible changes occur in the brain and body. In addition to the hallmark rapid eye movement and presence of dreams, a few of these other changes are:

  • Increased blood pressure and heart rate
  • Increased oxygen use by the brain
  • Rapid and irregular breathing
  • Bodily twitching, mostly in the face, arms, and legs

One of the most amazing findings is increased brain activity that is similar to awake states. This signifies key functions and transformations that are being undertaken by our brain, neurochemistry, and neural network. All this as we sleep.

REM Sleep and Our Dreams

As the sleep cycles progress throughout the night, the REM stage, and therefore dreams, become longer. The final stage is typically the longest and can last up to an hour.[5] The final stage is typically the longest and lasts anywhere from an hour up to two hours.

In total, about two hours of sleep per night is spent on dreams. Some scientists believe that dreams represent the expression of fragmented brain activity caused by attempts by the cerebral cortex to interpret neural signals. To prevent us from acting out dreams and becoming injured, the neurotransmitters shut down the body’s motor neurons, thus causing temporary paralysis.

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Is sometimes called “paradoxical sleep,” because it arouses some systems while paralyzing others.[6] Without this preventive safety measure in place, a condition called REM sleep disorder could occur.

Why is REM Sleep Important?

The quality of our sleep has a major impact on our ability to function during the day. Even more importantly, it plays a critical role in long-term health and cognitive function.

It’s during REM that the brain exercises and solidifies its neural connections. It has been accepted as the learning phase of the sleep cycle. The brain integrates, processes, and synthesizes information to store into long-term memory.

The modulation of emotional memory (such as fear) has been attributed to the sleep process. This is accomplished through the selective storing of memories within the hippocampus, a part of the brain responsible for flexible cognition and social behavior.[7,8]

It may be a key factor in enhancing creative thinking. Some researchers theorize that decreased levels of certain neurotransmitters (norepinephrine and acetylcholine) during REM initiate the integration of associative pathways that would normally be inhibited while awake.

Am I Getting Enough REM Sleep?

It’s likely that you will be able to notice when it’s at its optimum level by how you feel during the day. The proper amount of REM sleep varies from person to person.

High-quality REM sleep lays the foundation for so many positive outcomes in daily life:

  • Problem-solving
  • Positive mood
  • Memory
  • Creativity
  • Maximized ability in learning new tasks and facing challenges
  • Effective stress management

When we get the appropriate level of REM sleep, we awake feeling rested and can be ready to effectively manage the demands that life throws at us.

How to Get More REM Sleep

First and foremost, it’s important to know that excellent-quality sleep is an individual journey. You don’t need to pour through extensive scientific research just to sleep soundly through the night. We all need to explore and develop our own sleep recipe.

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Common life and work stressors, sudden changes (such as job loss), or medical problems often have a way of disrupting healthy sleep habits. There are several things that you can do right now to harness its powers.

  • Prepare your sleeping area (e.g. darkened room, cooling mattress, comfortable bedding).
  • Sleep cooler with the Dock Pro, a cooling mattress pad.
  • Avoid sleep deprivation “triggers” such as alcohol or caffeine.
  • Slow down as sleep time approaches: practice meditation, relaxation techniques.
  • Use dim lights and blue light blocking glasses if must use a computer and other electronic equipment.
  • Maintain an optimum room temperature of between 65 and 72 degrees Fahrenheit.

Ask your doctor if you have any medical conditions or are taking any medications that might interfere with REM or other sleep needs.

The Body Asleep…Your Brain Wide Awake

So, the next time you lay your head down for a good night’s dream-time, remember that it’s definitely not a waste!

Think of sleep as a time for creativity, free associations, problem-solving, and actively learning new things…storing them into your long-term memory for future use. As you awaken feeling bright and rested, you know that you can meet your challenges, have fun, and be productive. Most of all, you can simply have a fabulous day.


[1] Felson, S. [Medical Reviewer] (2020, October 16). What are REM and non-REM sleep. WebMD.

[2] Summer, J. (2021, December 17). What is REM sleep and how much do you need? The Sleep Foundation.

[3] Cleveland Clinic. (2020, December 7). Sleep Basics.

[4] Felson, S. [Medical Reviewer] (2020, October 16). What are REM and non-REM sleep. WebMD.

[5] Ibid.

[6] Summer, J. (2021, December 17). What is REM sleep and how much do you need? The Sleep Foundation.

[7] Hutchison, I.C., Rathore, S. (2015) Role of REM sleep theta in emotional memory. Frontiers in Psychology, 6. Art. 149.  

[8] Rubin, R.D., Watson, P.D., Duff, M.C., Cohen, N.J. (2014). The role of the hippocampus in flexible cognition and social behavior. Frontiers in Human Neuroscience, 8,742. Retrieved from:

About the Author

Tara Youngblood

Tara Youngblood

Tara Youngblood is ChiliSleep’s co-founder and CEO. An accomplished scientist, author, and speaker, Tara’s unique ideas are revolutionizing the future of sleep health by making sleep easy, approachable, and drug-free.
Learn more about Tara.

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