Which statement best describes voluntary muscle activity during sleep

A)  It does not occur in NREM sleep. 
B)  It does not occur during either REM or NREM sleep. 
C)  It is at its lowest during REM sleep. 
D)  It is at its highest during REM sleep.

Voluntary Muscle Activity

Muscle movements that are consciously controlled by the brain, typically involving the skeletal muscles.

NREM Sleep

Non-Rapid Eye Movement sleep, which is characterized by slower brain waves and is considered restorative sleep.

REM Sleep

REM sleep, or Rapid Eye Movement sleep, is a stage of sleep characterized by fast eye movements, vivid dreams, and increased brain activity.