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The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1]
There are four sleep cycle stages, beginning with light sleep and ending with REM sleep. Each stage has a different effect on the body, and each is important for sleep quality.
Each sleep stage plays a part in allowing the mind and body to wake up refreshed. Understanding the sleep cycle also helps explain how certain sleep disorders, including insomnia and obstructive sleep apnea, can impact a person’s sleep and health.
Ideally, you need four to six cycles of sleep 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 ...
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When you sleep, you cycle through two phases of sleep: rapid eye movement (REM) and non-REM sleep. The cycle starts over every 80 to 100 minutes. Usually there are four to six cycles per night. You may wake up briefly between cycles.
Your body cycles through the stages of sleep each night: three stages of non-REM sleep and one stage of REM sleep. During these sleep cycles, our breathing, heart rate, muscles, and brain...
Sleep is a natural process that your body uses to rest and repair itself. While it might seem as simple as closing your eyes and nodding off, sleep is anything but simple. In fact, modern medicine’s understanding of sleep, what it does and how it works is just getting off the ground.
A typical sleep cycle lasts about 90 to 110 minutes, consisting of different stages: non-REM sleep stages 1, 2, 3, and the REM (Rapid Eye Movement) stage. Most adults experience 4 to 6 of these cycles per night.
As your body progresses through the four sleep cycle stages—stages 1 through 3 (non-rapid eye movement, or NREM) and rapid eye movement sleep, or REM sleep, it transitions through different biological processes that affect your temperature, breathing, cells, and muscles.