Which of the following occurs as a normal night's sleep progresses?
A) Stage 4 and REM both increase.
B) Stage 4 and REM both decrease.
C) Stage 4 increases, while REM decreases.
D) Stage 4 decreases, while REM increases.

Question

Quizplus · Accepted Answer

As the night progresses, Stage 4 deep sleep decreases while REM sleep increases. This is known as the sleep cycle and repeats itself throughout the night, with each cycle lasting around 90 minutes. Therefore, the correct choice is D.

Which of the Following Occurs as a Normal Night's Sleep