Sleep has four stages: three stages consist of non-rapid eye movement sleep (non-REM sleep) and one stage consists of rapid eye movement sleep (REM sleep). The organized and structured process of normal sleep is known as sleep architecture. Typical sleep architecture consists of four cycles, each lasting an average of 90 minutes.

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0:00 The 4 Stages of Sleep
1:26 N Stages vs REM Sleep
2:06 N1 Stage
3:36 N2 Stage
5:14 N3 Stage
6:16 REM Sleep

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#stagesofsleep #remsleep #sleepcycle