How long is a typical sleep cycle,in which a sleeper progresses through some or all of the sleep stages?
A) 1 hour
B) 90 minutes
C) 2 hours
D) several hours

Question

Quizplus · Accepted Answer

A typical sleep cycle lasts around 90 minutes, during which a sleeper progresses through all the stages of sleep, including light sleep, deep sleep, and REM sleep. This cycle repeats several times throughout the night, and the length of each cycle may vary slightly.

How Long Is a Typical Sleep Cycle,in Which a Sleeper