Herbie Murray
Sleep is a complex process that involves four stages, three of which are non-rapid eye movement (NREM) sleep and one of which is rapid eye movement (REM) sleep. The first stage is light sleep, where your body and brain activity slows down. In the second stage, your breathing, heartbeat and brain activity continue to slow, your muscles relax and your body temperature drops. The third stage is deep sleep, where your brain waves are slow but strong, and your body repairs injuries and reinforces your immune system. The fourth stage is REM sleep, which is believed to be essential for cognitive functions such as memory, learning and creativity.
| Characteristics | Values |
|---|---|
| Sleep cycle duration | 90 minutes |
| Number of sleep cycles needed | 4-6 |
| Number of stages in a sleep cycle | 4 |
| First stage | Light sleep |
| Second stage | Core sleep |
| Third stage | Deep sleep |
| Fourth stage | REM sleep |
| First half of sleep | Dominated by deep sleep |
| Second half of sleep | Dominated by REM sleep |
| Purpose of REM sleep | Essential to cognitive functions such as memory, learning, and creativity |
| Purpose of deep sleep | Repair injuries and reinforce the immune system |
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What You'll Learn
Deep sleep
Sleep is divided into four stages, three of which form non-rapid eye movement (NREM) sleep and one rapid eye movement (REM) sleep. The first two stages are considered light sleep, while the third and fourth stages are deep sleep and REM sleep, respectively. During the first stage of light sleep, your body and brain activity begins to slow down, your muscles relax, and your body temperature drops. In the second stage, your breathing, heartbeat, and brain activity slow further, and your muscles relax even more. This is also when your arms and legs become temporarily paralysed, preventing you from acting out your dreams.
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REM sleep
Sleep is divided into four stages, three of which are non-rapid eye movement (NREM) sleep and one of which is rapid eye movement (REM) sleep. While the time spent in each stage varies depending on how long you've been asleep, and you might bounce between stages each night, each individual stage remains largely the same.
Stage 2 of the sleep cycle is still considered light sleep, but you are now drifting into a steadier sleep and it's harder for you to be jostled awake. Your breathing, heartbeat and brain activity are starting to slow down, your muscles are relaxing, and your body temperature drops. However, your brain does have short bursts of activity that actually help resist being woken up by external stimuli that may have woken you up in stage 1, such as a dog barking next door. Stage 2 is commonly referred to as "core" sleep, and you may see it referred to this way on sleep-tracking apps.
Babies and children need more stage 3 sleep, and the older you get, the less you need. In stage 3, your brain waves are slow but strong. Your body takes advantage of this very deep sleep stage to repair injuries and reinforce your immune system.
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Light sleep
During light sleep, your body and brain are preparing for deeper sleep. Your eye movement stops, and your brain waves slow down. This is a critical stage in the sleep cycle, as it helps you transition into a deeper sleep state. While you may still be easily woken during this stage, your brain is working to keep you asleep and resist external disturbances.
The length of time spent in light sleep can vary from person to person and even from night to night. Factors such as stress, sleep environment, and sleep habits can influence how long it takes to transition through this stage. However, on average, light sleep typically lasts for about five to ten minutes.
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The sleep cycle
Sleep is divided into four stages, three of which are non-rapid eye movement (NREM) sleep and one of which is rapid eye movement (REM) sleep. An average sleep cycle lasts about 90 minutes, and you need four to six cycles of sleep every 24 hours to feel fresh and rested.
The first stage of sleep is light sleep, during which your body and brain activity begins to slow down. Your muscles relax, your heart rate and breathing slow down, and your eye movement stops. You are still easily woken during this stage.
The second stage is still considered light sleep, but it is harder for you to be jolted awake. Your breathing, heartbeat and brain activity continue to slow down, and your body temperature drops. Your brain has short bursts of activity that help resist being woken up by external stimuli. This stage is commonly referred to as "core" sleep.
The third stage is deep sleep, during which your brain waves are slow but strong. Your body takes advantage of this stage to repair injuries and reinforce your immune system. Babies and children need more of this stage of sleep, and the older you get, the less you need.
The fourth and final stage is REM sleep, during which your arms and legs become temporarily paralysed to prevent you from physically acting out your dreams. REM sleep is believed to be essential to cognitive functions such as memory, learning, and creativity. While deep sleep tends to dominate the first half of your sleep, REM sleep tends to take over the latter half, getting longer as you sleep.
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The importance of sleep
Sleep is essential for your health and wellbeing. An average sleep cycle lasts about 90 minutes, and you need four to six of these cycles every 24 hours to feel fresh and rested. Each cycle contains four individual stages: three that form non-rapid eye movement (NREM) sleep and one rapid eye movement (REM) sleep.
The first stage of sleep is light sleep, where your body and brain activity begins to slow down. Your muscles relax, your heart rate and breathing slow, and your body temperature drops. During the second stage of sleep, you are still in a light sleep, but it's harder for you to be jolted awake. Your brain has short bursts of activity that help resist being woken up by external stimuli. This stage is commonly referred to as "core" sleep.
The third stage of sleep is deep sleep, where your brain waves are slow but strong. Your body uses this time to repair injuries and reinforce your immune system. The fourth and final stage is REM sleep, which is believed to be essential for cognitive functions such as memory, learning, and creativity. While deep sleep tends to dominate the first half of your sleep, REM sleep takes over the latter half, getting longer as you sleep.
Getting enough sleep is crucial for maintaining your physical and mental health. It allows your body to repair and recover, and it supports various cognitive functions. Adequate sleep also helps improve your mood, energy levels, and overall well-being.
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Frequently asked questions
There are four stages of sleep, three of which are non-rapid eye movement (NREM) sleep and one of which is rapid eye movement (REM) sleep.
REM sleep is believed to be essential to cognitive functions such as memory, learning and creativity. Your arms and legs become temporarily paralysed during this stage to prevent you from physically acting out your dreams.
During NREM sleep, your muscles relax, your body temperature drops and your heart rate and breathing slow down.
