Stages of Sleep: What Happens in a Sleep Cycle
2023年12月8日 · What Are the Sleep Stages in a Normal Sleep Cycle? There are four sleep stages, including one for rapid eye movement (REM) sleep and three that form non-REM (NREM) sleep. These stages are determined based on an analysis of brain activity during sleep, which shows distinct patterns that characterize each stage.
What Happens When You Sleep: The Science of Sleep - Sleep …
2009年12月22日 · During a normal sleep period, you progress through four to five sleep cycles. Each sleep cycle is made up of four individual sleep stages. The four stages of sleep are further broken down into two categories: rapid eye movement (REM) and non-REM sleep.
How Sleep Works: Understanding the Science of Sleep
2020年10月23日 · The structure of a person’s sleep stages and cycles is known as their sleep architecture. While deep sleep and REM sleep involve more profound changes in activity levels, experts believe that each stage plays a part in a healthy sleep architecture that …
Slow-Wave Sleep: An Overview - Sleep Foundation
2023年5月15日 · During a night of sleep, children and adults progress through four sleep stages: three stages of non-rapid eye movement (NREM) sleep and one stage of rapid eye movement (REM) sleep. Each stage is associated with certain changes in activity in the brain and body.
REM Sleep: What It Is and Why It’s Important - Sleep Foundation
2024年3月22日 · Each stage of sleep is distinct: Stage 1 (Light Sleep): As your brain slows down, low-amplitude mixed-frequency (LAMF) activity replaces the alpha brain waves that took over as you became drowsy. Your body has some muscle tone, and your breathing is regular. Stage 2 (Light Sleep): Your heart rate and body temperature both decrease.
How Much Deep Sleep Do You Need? - Sleep Foundation
2024年3月22日 · Stage 1: This brief, drowsy stage marks the transition to sleep, when your breathing and heartbeat start to slow down. Stage 2: In this stage of light sleep, your breathing and heart rate slow even more. Your temperature drops, and your muscles relax. Stage 2 sleep lasts longer in each cycle throughout the night.
What Happens During NREM Sleep? - Sleep Foundation
2023年11月3日 · Experts divide sleep into four stages of rapid eye movement (REM) and non-rapid eye movement (NREM) sleep. Each stage plays an important role in repairing and rebuilding the brain and body. Throughout the night, you cycle multiple times through all four sleep stages. A complete cycle takes approximately 90 minutes.
Why Do We Need Sleep? - Sleep Foundation
2024年4月5日 · Stages of Sleep. Our sleep architecture—that is, the way the body cycles through specific stages of sleep—enables the beneficial processes that occur during sleep, such as healing and learning. There are three non-rapid eye movement (non-REM) stages of sleep followed by rapid eye movement (REM), the final stage of
Infant Sleep Cycles: How Are They Different From Adults? - Sleep …
2023年4月26日 · What Does a Baby’s Sleep Cycle Look Like? Generally, researchers identify two sleep stages in newborn babies and four sleep stages in babies over three months old. The newborn sleep stages are rapid eye movement (REM) and non-rapid eye movement (NREM).
What Is Paradoxical Sleep? - Sleep Foundation
2023年12月21日 · The first three stages are called non-REM (NREM) sleep, and the fourth stage is called REM sleep. Most people complete four to six cycles of all the sleep stages each night.