Ashwin Lewis
Sleep is a bodily process that is essential for your health and well-being. It is divided into several stages, with two of the most well-known being rapid eye movement (REM) sleep and deep sleep. REM sleep is believed to be vital for cognitive functions such as memory, learning, and creativity, while deep sleep is associated with physical restoration and health. The amount of time spent in each stage varies throughout a person's life, with newborns spending about half their sleep in REM sleep, which gradually decreases with age. A healthy balance between REM and deep sleep is necessary for waking up feeling rested and maintaining overall health.
| Characteristics | Values |
|---|---|
| REM sleep | Rapid Eye Movement sleep, the last stage of the sleep cycle before it starts over. |
| REM sleep percentage | Adults spend about 20-25% of their sleep in REM. |
| REM sleep duration | The first REM cycle of the night begins about 90 minutes after falling asleep and recurs every 90 minutes. |
| REM sleep and dreams | Dreaming typically happens during REM sleep. |
| REM sleep and brain activity | Brain activity spikes during REM sleep, resembling activity patterns when awake. |
| REM sleep and physical changes | During REM sleep, heart rate, blood pressure, and breathing increase, and the eyes move rapidly. The muscles in the arms and legs become temporarily paralysed. |
| REM sleep and age | REM sleep needs shift with age. Newborns spend about half their sleep time in REM sleep, while older adults tend to need less REM sleep. |
| Core sleep | Core sleep is another name for stage 2 of the sleep cycle, which is considered light sleep. |
| Core sleep duration | Core sleep can last for 10 to 25 minutes and usually becomes longer with each occurrence throughout the night. |
| Core sleep percentage | People typically spend about half of their sleeping time in core sleep. |
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What You'll Learn
REM sleep is when dreaming occurs
Sleep is a bodily process that allows the body to rest, repair, and restore itself. A person cycles through various stages of sleep, including light NREM sleep, deep NREM sleep, and REM sleep.
REM sleep, or rapid eye movement sleep, is a stage in the sleep cycle when dreaming typically occurs. During REM sleep, the eyes move around rapidly in different directions, and brain activity spikes, resembling activity patterns from when we are awake. This stage is strongly associated with vivid dreams. The first REM episode of the night is usually short, lasting only a few minutes, but subsequent episodes lengthen, with the final one lasting up to half an hour. In total, adults should aim for about 20-25% of their sleep to be REM sleep.
REM sleep is believed to be essential for cognitive functions such as memory, learning, and creativity. It helps the brain prune its synapses, improving memory and problem-solving abilities, and aids in processing emotional memories, including those associated with fear. Additionally, REM sleep is thought to contribute to the development of the central nervous system, which includes the brain and spinal cord.
The amount of REM sleep one needs changes with age. Newborns spend about half their sleep time in REM sleep, which gradually decreases throughout childhood and adolescence. By age 20, most people spend just over 20% of their sleep in REM, and this percentage slightly decreases with advancing age.
If you don't get enough REM sleep one night, your body will naturally try to compensate the next night through a process called REM rebound, where you enter the REM stage earlier and stay in it for longer. However, consistently getting insufficient REM sleep can lead to daytime fatigue, mood swings, difficulty concentrating, memory issues, and a general feeling of not being well-rested. Over time, it can increase the risk of chronic health conditions, affect mental health, and diminish immune function.
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Deep sleep is when the body repairs itself
Sleep is a body process that allows your body to rest, repair, and restore itself. A person cycles through different stages of sleep, including REM sleep and non-REM sleep. REM stands for rapid eye movement, and it is during this stage that our eyes move rapidly in various directions, even though they are closed. Our brain activity spikes during REM sleep, resembling activity patterns from when we are awake. Dreams typically occur during REM sleep.
Non-REM sleep, on the other hand, is when our brain is not as active. In the deeper stages of non-REM sleep, our breathing slows down, and our blood pressure drops. This is the stage when the body repairs and restores itself. The deepest stage of non-REM sleep is stage 3, which makes up about 25% of total sleep time in adults. During this stage, the body repairs injuries, builds bone and muscle, and strengthens the immune system.
Deep sleep helps with physical restoration and energy replenishment. It is essential throughout life, even as the amount of deep sleep we get decreases with age. Getting enough deep sleep is crucial for feeling rested and staying healthy. If you are not getting enough deep sleep, you may experience symptoms such as daytime fatigue, mood swings, difficulty concentrating, and memory issues.
The amount of deep sleep a person needs can vary. It is influenced by factors such as age, recent sleep patterns, alcohol consumption, and sleep disorders. To increase the quality of your deep sleep, it is recommended to maintain a consistent sleep schedule, create a restful sleeping environment, and avoid stimulants close to bedtime.
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Sleep cycles last between 90 and 120 minutes
Sleep is a body process that allows your body to rest, repair and restore itself. It is divided into five stages: wake, N1, N2, N3, and REM. N1 to N3 are considered non-rapid eye movement (NREM) sleep, with each stage leading to progressively deeper sleep. During NREM sleep, your brain is not as active and, in the deeper stages, your breathing slows down and your blood pressure drops. REM sleep, on the other hand, is when your eyes move rapidly behind your eyelids, and your brain activity is similar to when you are awake. This is the stage when most dreams occur.
Sleep cycles, which consist of three stages of NREM sleep and a stage of REM sleep, typically last between 90 and 120 minutes. The first sleep cycle of the night is often the shortest, ranging from 70 to 100 minutes, while later cycles tend to be longer, falling between 90 and 120 minutes. On average, a sleep cycle lasts about 90 minutes. Sleep cycles can vary from person to person and from night to night, depending on factors such as age, recent sleep patterns, and alcohol consumption.
During the first stage of NREM sleep, your body hasn't fully relaxed, but your body and brain activities start to slow, with periods of brief movements. This stage usually lasts one to seven minutes and it is easy to wake someone up during this stage. As you transition to the second stage of NREM sleep, your brain waves slow down further and have noticeable pauses between short bursts of electrical activity. Experts believe that these bursts are your brain organizing memories and information from when you were awake. Stage 2 NREM sleep accounts for about 45% of your time asleep and you will go through multiple rounds of it, with each round longer than the last.
The third stage of NREM sleep is the deepest and it can be hard to wake someone up from it. During this stage, your brain waves are slow but strong, and your body takes advantage of the very deep sleep to repair injuries and strengthen the immune system. Stage 3 NREM sleep makes up about 25% of your total sleep time in adults, but the percentage is higher for babies and children. As you get older, you need less of this deep sleep and spend more time in the second stage of NREM sleep.
After the third stage of NREM sleep, you enter REM sleep. This stage usually starts about 90 minutes after falling asleep, with each REM cycle increasing in length throughout the night. The first cycle typically lasts around 10 minutes, while the final cycle can last up to an hour. REM sleep makes up about 20% of an adult's total sleep time, although this percentage is much higher for babies. REM sleep is important for dreaming and learning and memory consolidation.
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REM rebound occurs after sleep deprivation
Sleep is a body process that allows the body to rest, repair, and restore itself. The sleep cycle consists of non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep. NREM sleep is further divided into three stages: N1, N2, and N3. REM sleep is important for dreaming, learning, and memory, while the deepest NREM sleep is when the body relaxes fully and repairs itself.
REM rebound is a compensatory response in which an individual experiences increased REM sleep temporarily. It occurs when the body compensates for lost sleep by increasing REM sleep duration in subsequent sleep cycles. REM rebound is characterized by sudden increases in REM activity, including prolonged duration or more frequent REM cycles. It can occur following sleep deprivation, stress, the initiation of continuous positive airway pressure, withdrawal from REM-suppressing drugs, or substance use.
Sleep deprivation occurs when a person does not sleep for the recommended minimum of seven hours. It is linked to various health issues and can increase the risk of conditions such as obesity, metabolic disorders, high blood pressure, and psychiatric conditions. When people are unable to obtain adequate REM sleep, the pressure to achieve REM sleep builds up. Once they are able to sleep, they will spend a higher percentage of the night in REM sleep.
REM rebound can also be influenced by factors such as stress, substance use, and suppressed REM sleep. Studies on animals indicate that REM rebound can occur after just 30 minutes of exposure to a stressor, with the percentage of sleep spent in REM rebound increasing as the stress response time extends. Additionally, certain psychotropic drugs, such as antidepressants and antipsychotics, are known to suppress REM sleep.
The occurrence of REM rebound highlights the importance of achieving specific sleep stages for brain function. It is a common phenomenon, observed in both humans and animals worldwide, and is the brain and body's way of restoring balance to the sleep cycle.
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Sleep needs change with age
Sleep is a body process that allows the body to rest, repair, and restore itself. Sleep is divided into two types: REM sleep and non-REM sleep. REM stands for rapid eye movement, and it is during this stage that dreams typically occur. Non-REM sleep, on the other hand, is when the body repairs and regenerates tissues, builds bone and muscle, and strengthens the immune system. A person cycles through these stages 4-5 times every night, with each cycle lasting around 90-110 minutes.
The amount of sleep we need varies by age. For example, children between the ages of 6 and 12 typically need 9 to 12 hours of sleep per night. As people age, they may experience changes in their sleep patterns, such as advanced sleep timing, shortened nocturnal sleep duration, an increased number of nocturnal awakenings, and decreased slow-wave sleep or deep sleep. Older adults are also more likely to experience disruptions in their circadian rhythms, which can result in early awakenings. Additionally, the ability to phase-shift decreases with age, which may further impact sleep patterns.
The quality of sleep may also change with age. Older adults may find that they have more difficulty falling asleep, maintaining sleep, or achieving deep sleep. This can be due to various factors, such as physiological changes, medical conditions, or the side effects of medications. It is important for older adults to consult with a healthcare provider before taking sleep medications, as these can sometimes have adverse effects or lead to dependence.
To optimize sleep as we age, it is recommended to maintain a consistent sleep schedule, avoid stimulating activities before bed, practice relaxation techniques, and limit screen time, especially in the hours leading up to bedtime. Regular exercise can also promote better sleep, but it should be avoided within 3 hours of bedtime. Additionally, limiting alcohol consumption and avoiding tobacco products can also improve sleep quality.
While sleep needs do change with age, it is important to prioritize sleep at every stage of life. Sleep is essential for our physical and mental well-being, and getting adequate, quality sleep can help protect against various health issues. By understanding the unique sleep needs associated with different ages, we can better manage our sleep habits and maintain overall health and well-being.
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Frequently asked questions
REM stands for rapid eye movement. During REM sleep, your eyes move around rapidly in different directions, and your brain is active. Your brain activity is similar to its activity when you’re awake. Dreams typically occur during REM sleep.
Core sleep is another name for the second stage of the sleep cycle, which is considered light sleep. During this stage, your breathing, heartbeat and brain activity start to slow down, your muscles relax, and your body temperature drops.
On average, adults need around 20-25% REM sleep and spend about half their sleeping time in core sleep. However, the amount of sleep required in each stage can vary from person to person and can change over time.
