The majority of slow-wave sleep occurs ____ the course of a night's sleep.
A) early in
B) late in
C) in the middle of
D) evenly distributed throughout

Question

Quizplus · Accepted Answer

Slow-wave sleep, also known as deep sleep or NREM sleep, occurs early in the night and typically takes up a larger portion of the first half of the sleep cycle. As the night progresses, periods of slow-wave sleep become shorter and the amount of REM sleep increases.

The Majority of Slow-Wave Sleep Occurs ____ the Course of a Night's