Shifts between deeper and lighter sleep
A)occur only during the last half of a night's sleep.
B)occur just once per night unless the sleeper is suddenly awakened.
C)occur repeatedly throughout the night.
D)are the first sign of sleep deprivation.

Question

Quizplus · Accepted Answer

Shifts between deeper and lighter sleep occur repeatedly throughout the night as part of the normal sleep cycle, including phases of REM and non-REM sleep.

Shifts Between Deeper and Lighter Sleep