Which of the following is NOT true of REM sleep?

A) Dreams are likely to occur during REM.
B) REM is most abundant toward the end of the night's sleep.
C) The major postural muscles are tense during REM.
D) Brain activity is similar to that during wakefulness.

REM Sleep

REM Sleep, or Rapid Eye Movement Sleep, is a unique phase of sleep characterized by random rapid movement of the eyes, vivid dreams, and increased brain activity.

Postural Muscles

Muscles primarily involved in stabilizing the body and maintaining posture.

Brain Activity

Refers to the various mental processes and physiological responses occurring within the brain, such as neuronal firing and synaptic activity.