Evie Summers
Sleep is essential for our health and wellbeing, and getting enough of it is crucial. But it's not just about the quantity of sleep; the quality of sleep matters too. Sleep occurs in cycles, and there are different stages of sleep, each serving a unique purpose. One of these stages is REM sleep, which stands for rapid eye movement sleep. REM sleep is generally when our most vivid dreams occur, and it plays a vital role in memory consolidation, emotional processing, brain development, and preparing the brain for waking up. While there is no official consensus on the required amount of REM sleep, it typically makes up about 20-25% of our sleep cycle, and adults should aim for seven to nine hours of sleep per night, including REM sleep.
| Characteristics | Values |
|---|---|
| Percentage of sleep cycle in REM | 20-25% |
| Average number of sleep cycles per night | 3-6 |
| Average REM sleep per night | 105-135 minutes |
| REM sleep as a percentage of total sleep for infants | 50% |
| REM sleep as a percentage of total sleep for adults | 25% |
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What You'll Learn
REM sleep and memory consolidation
REM sleep is believed to be essential for cognitive functions such as memory, learning, and creativity. It is also associated with dreaming and memory consolidation. While there is no official agreement on how much REM sleep one needs, experts believe that it is important for dreaming and that dreaming helps process emotions.
REM sleep is the fourth of four stages of sleep. It is characterised by relaxed muscles, quick eye movement, irregular breathing, elevated heart rate, and increased brain activity. The first REM cycle of the night begins about 60 to 90 minutes after falling asleep and recurs every 90 minutes. The cycle includes three stages of non-REM sleep, followed by one stage of REM sleep. Each cycle through all the sleep stages takes 90 to 120 minutes to complete.
During REM sleep, the brain processes new learnings and motor skills from the day, committing some to memory, maintaining others, and deciding which ones to delete. However, the evidence for the REM sleep-memory consolidation hypothesis is considered weak and contradictory. Animal studies correlating changes in REM sleep parameters with learning have produced inconsistent results and are confounded by stress effects.
Human studies have also produced mixed results. Some studies have shown that REM sleep deprivation does not affect learning certain types of memory, while others have shown that it does. Furthermore, the absence of major memory deficits in humans with drug- or lesion-induced REM sleep suppression suggests that REM sleep may not have a critical role in learning and memory consolidation.
However, it is important to note that sleep disruption occurring before learning will affect performance in learning tasks. This disruption is not due to the loss of sleep per se, but rather to the intrusions of sleep into waking during the learning task. Overall, while the role of REM sleep in memory consolidation is still not fully understood, it is clear that adequate sleep is vital for optimal performance in learning tasks.
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REM sleep and emotional processing
REM sleep is believed to be essential to cognitive functions such as memory, learning, and creativity. It is also thought to play a role in emotional processing, with some studies suggesting that REM sleep deprivation interferes with memory formation.
REM sleep is associated with dreaming and memory consolidation, and is believed to be important for regulating our emotional brain state. Dreaming is thought to be a key to accessing our inner world, and REM sleep is often associated with more vivid and emotionally colourful dreams.
REM sleep deprivation has been found to affect emotional reactivity and social function, with negative emotional reactivity being enhanced and positive reactions to positive events being subdued. This is thought to be due to the increased reactivity towards aversive emotional information that occurs when the normal regulation of the limbic system fails.
REM sleep dreaming plays a crucial role in modulating people's emotions, with dreams being more vivid and emotionally colourful during REM sleep. REM sleep may be adaptive to process aversive experiences such as traumatic experiences, by presenting them as strange images and fragmented episodes of related or similar stories.
REM sleep deprivation is characterised by an increased reactivity towards aversive emotional information. Together with the decrease in medial prefrontal activation, the regulation of emotions gets dysfunctional. Healthy sleep repairs adaptive processing, functional brain activity, integrity of the medial prefrontal cortex-amygdala connections, and thus improves the capacity to regulate emotions as well as an individual's well-being.
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REM sleep and dreaming
Sleep is essential for health and well-being, and getting enough quality sleep is crucial for a healthy brain and body. Sleep occurs in cycles, and there are four stages of sleep, three non-rapid eye movement (NREM) stages and one rapid eye movement (REM) stage.
REM sleep is the fourth and final stage of the sleep cycle, and it is when we tend to dream. It is characterised by relaxed muscles, quick eye movement, irregular breathing, elevated heart rate, and increased brain activity. The first REM cycle of the night begins about 60 to 90 minutes after falling asleep and lasts for about 10 minutes. As sleep progresses, the REM stage gets longer, with the final REM phase lasting up to 60 minutes. On average, a person will spend 20-25% of their sleep cycle in the REM stage, which is believed to be essential for cognitive functions such as memory, learning, and creativity.
REM sleep is important for several reasons. Firstly, it plays a role in dreaming, with the majority of dreams occurring during this stage. While it is a common myth that dreaming only occurs during REM sleep, the dreams that occur during this stage tend to be more vivid than those that occur during non-REM sleep. Secondly, REM sleep is important for memory consolidation, with the brain processing and committing new learnings and motor skills from the day to memory. Thirdly, REM sleep is involved in emotional processing, with dreams potentially playing a role in this process by activating the amygdala, the part of the brain responsible for processing emotions. Finally, REM sleep may promote brain development, as newborns spend most of their sleep time in this stage, and animals born with less developed brains spend more time in REM sleep during infancy.
While there is no official agreement on how much REM sleep a person needs, experts recommend that adults get at least seven hours of sleep per night, with REM sleep accounting for about 25% of this. However, this can vary depending on age, lifestyle, and other factors, as REM intervals decline with age. If you are concerned that you are not getting enough REM sleep, you can try improving your sleep hygiene by maintaining a consistent sleep schedule, avoiding screen time before bed, reducing substance use, developing a regular exercise routine, and ensuring your sleeping environment is dark, cool, and quiet.
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REM sleep and brain development
Sleep is important for brain development, and rapid eye movement (REM) sleep plays a vital role in this process. REM sleep is believed to facilitate the development of the central nervous system by maintaining and establishing new connections, particularly during early brain development.
REM sleep is characterised by relaxed muscles, quick eye movement, irregular breathing, elevated heart rate, and increased brain activity. It is also known as "dream sleep", as it is when we tend to dream. Dreaming is thought to help us process emotions, and the amygdala (the part of the brain that processes emotions) is activated during this stage of sleep.
REM sleep is also important for memory consolidation, which is the process of committing new learnings and motor skills from the day to memory. Studies have shown that sleep deprivation during early development has a detrimental impact on brain maturation, suggesting that REM sleep is crucial for brain development.
The amount of REM sleep needed varies depending on age. Newborn babies spend eight hours in REM sleep each day, while adults only need an average of two hours of REM sleep each night.
REM sleep and non-rapid eye movement (NREM) sleep work together to support brain development. While REM sleep is important for forming new connections, NREM sleep is thought to play a role in pruning and maintaining these connections.
Understanding the links between sleep and brain development is crucial, as insufficient REM sleep can impact our ability to process emotions and consolidate memories. Ensuring sufficient sleep quality and duration is essential for maintaining optimal brain health.
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REM sleep and sleep disorders
Sleep is divided into four distinct stages, each responsible for providing unique benefits. The fourth stage, REM sleep, is characterised by relaxed muscles, quick eye movement, irregular breathing, elevated heart rate, and increased brain activity. It is also the stage of sleep in which we dream.
While there is no official agreement on how much REM sleep is required, experts believe that dreaming helps us process emotions, and it is recommended that adults get around two hours of REM sleep per night. REM sleep is believed to be essential to cognitive functions such as memory, learning, and creativity.
REM sleep behaviour disorder (RBD) is a parasomnia involving dream enactment behaviour associated with a loss of muscle tone during REM sleep. This can result in violent movements, which can cause injury to oneself or one's sleeping partner. RBD has been linked to antidepressant use, narcolepsy, and neurodegenerative diseases such as Parkinson's disease, Lewy body dementia, and multiple system atrophy. Diagnosis of RBD requires an in-laboratory sleep study to confirm abnormal behaviours during REM sleep and exclude other sleep disorders. Treatment options include medication such as melatonin or clonazepam, as well as lifestyle changes and injury prevention techniques.
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Frequently asked questions
REM stands for rapid eye movement sleep. It is the sleep stage when dreams happen and is the crucial last phase of each sleep cycle.
There are no set guidelines for the amount of REM sleep a person needs. However, adults should aim for seven to nine hours of sleep per night, with 20-25% of that time spent in the REM sleep stage.
If you don't get enough REM sleep, you may feel grogy and disoriented. Longer-term REM deprivation may result in more serious health concerns, including an increased risk of cardiovascular issues and cognitive decline.
To increase your REM sleep, it's important to focus on improving your overall sleep habits. This includes sticking to a sleep schedule, avoiding screen time before bed, and cutting down on substances like alcohol and caffeine.
During REM sleep, your eyes move rapidly, your heart rate increases, your breathing becomes irregular, and your brain is highly active. In contrast, during non-REM sleep, your eyes are still, your brain waves are slower, and you maintain some muscle tone.
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