In the first part of a night's sleep,_____ sleep is prominent,whereas in the second part,_____ sleep dominates.
A) REM;NREM
B) NREM;REM
C) stage 1;stage 3
D) stage 3;stage 1

Question

Quizplus · Accepted Answer

The first part of the night's sleep is dominated by NREM sleep, while in the second part, REM sleep dominates. Therefore, choice B, NREM-REM, is the best answer. Choices A, C, and D are all incorrect. While REM sleep is prominent later in the night, it is not present in the first part of the night. Stage 1 and stage 3 refer to specific stages of NREM sleep, so these choices are not encompassing all of the sleep stages. Additionally, stage 3 is a deeper stage of NREM, whereas stage 1 is a lighter stage, so they are not accurate descriptors of the first and second parts of the night's sleep.

In the First Part of a Night's Sleep,_____ Sleep Is