In a typical sleeper, a complete cycle of REM and NREM sleep is about 90 minutes long.

Name: In a typical sleeper, a complete cycle of REM and NREM sleep is about 90 minutes long.
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A typical sleep cycle lasts around 90 minutes, during which an individual transitions from non-REM (NREM) sleep to REM sleep and back to NREM sleep again. This cycle is repeated multiple times throughout the night, with the length of REM stages increasing as the night progresses.

In a Typical Sleeper, a Complete Cycle of REM and NREM