As the night goes on, periods of REM sleep __________ and episodes of slow-wave sleep __________.
A) get longer; get shorter
B) get shorter; get longer
C) get longer; stay about the same
D) stay about the same; get shorter
E) get longer; get longer

Question

Quizplus · Accepted Answer

As the night progresses, REM sleep periods tend to increase in duration, while slow-wave sleep (deep sleep) episodes decrease in length.

As the Night Goes On, Periods of REM Sleep __________