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

Name: In a normal sleeper, a complete cycle of REM and NREM sleep is about 90 minutes long.
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Quizplus · Accepted Answer

This is true. A typical sleep cycle for a healthy adult is about 90 minutes long and consists of 5 stages of sleep, including both REM (rapid eye movement) and NREM (non-rapid eye movement) sleep. The exact duration and number of cycles may vary from person to person.

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