The sleep cycle, alternating between periods of REM and non-REM sleep, lasts approximately ________ minutes.

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The sleep cycle lasts approximately 90 minutes, which includes both non-REM and REM stages of sleep. This cycle repeats throughout the night, with the length of each stage varying throughout the night. REM (rapid eye movement) sleep generally occurs in shorter intervals than non-REM sleep, and is associated with dreaming and increased brain activity.

The Sleep Cycle, Alternating Between Periods of REM and Non-REM