Which statement is true of sleep cycles in normal sleep?
A) They last about 90 minutes, have 1 or more stages of NREM sleep followed by REM sleep.
B) They last about 90 minutes and each consists of 1 or more stages of REM sleep.
C) They last about 60 minutes, have 1 stage of NREM sleep followed by REM sleep.
D) They last about 90 minutes and each consist of REM sleep followed by 4 stages of NREM sleep.

Question

Quizplus · Accepted Answer

Sleep cycles typically last about 90 minutes and consist of one or more stages of NREM (non-rapid eye movement) sleep, followed by a stage of REM (rapid eye movement) sleep. This cycle repeats throughout the night, with the length of each stage and the overall duration of each cycle varying from person to person.

Which Statement Is True of Sleep Cycles in Normal Sleep