For a normal person, which part of a night's sleep contains the largest percentage of stage 4 sleep?
A) early in the night
B) the middle of the night
C) toward the end of the night
D) all parts equally

Question

Quizplus · Accepted Answer

Stage 4 sleep (also known as slow-wave sleep or deep sleep) typically occurs early in the night and decreases as the night progresses. Therefore, the largest percentage of stage 4 sleep occurs early in the night.

For a Normal Person, Which Part of a Night's Sleep