Periods of REM sleep alternate with periods of non-REM sleep in a cycle that recurs about every _______________ minutes.

Name: Periods of REM sleep alternate with periods of non-REM sleep in a cycle that recurs about every _______________ minutes.
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Question

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The cycle of alternating periods of REM and non-REM sleep is approximately 90 minutes long. This cycle repeats throughout the night with each cycle becoming longer towards morning.

Periods of REM Sleep Alternate with Periods of Non-REM Sleep