Throughout the night's sleep,periods of REM sleep occur about every _________ minutes.

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REM sleep occurs approximately every 90 minutes throughout the night. During a typical night's sleep, a person will go through four to six cycles of non-REM and REM sleep. Each cycle lasts around 90 minutes, with the majority of that time spent in non-REM sleep. The first cycle has a shorter period of REM sleep, but the duration of the REM sleep periods progressively increase with each subsequent cycle.

Throughout the Night's Sleep,periods of REM Sleep Occur About Every