Periods of REM sleep alternate with periods of non-REM sleep in a cycle that recurs about every _____________ minutes or so.
A) 30-40
B) 90-100
C) 150-160
D) 210-220

Question

Quizplus · Accepted Answer

Periods of REM sleep alternate with periods of non-REM sleep in a cycle that recurs about every 90-100 minutes or so. This cycle repeats itself multiple times throughout the night, with the length of REM sleep increasing with each cycle.

Periods of REM Sleep Alternate with Periods of Non-REM Sleep