On the average, each complete cycle through the stages of NREM sleep and REM sleep lasts about:
A) 20 minutes.
B) 1 hour.
C) 90 minutes.
D) 8 hours.

Question

Quizplus · Accepted Answer

On average, each complete cycle through the stages of NREM sleep and REM sleep lasts about 90 minutes. This cycle repeats throughout the night, with the length of each cycle gradually lengthening as the night progresses, and the amount of time spent in REM sleep increasing with each cycle.

On the Average, Each Complete Cycle Through the Stages of NREM