Sleep cycles naturally shift throughout the night, lasting between 70 to 120 minutes. Age, recent sleep patterns, and alcohol intake can affect sleep quality.
Understanding the sleep cycle can help you identify and address sleep quality and duration issues.
Sleep Is Divided Into Five Stages
Sleep is divided into two types: NREM and REM. NREM has three stages, followed by deep sleep and then REM sleep. Some classify it into four stages. NREM focuses on physical restoration.
On the other hand, REM sleep is a unique stage of sleep characterised by rapid eye movement, muscle paralysis, and vivid dreaming, which is essential for cognitive and emotional restoration.
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Stage 1
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Stage 2 (Light Sleep)
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Stage 3 (Deep)
After the three NREM sleep stages, you enter the Rapid Eye Movement (REM) stage.
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REM SLEEP
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