Stage 3 NREM and Stage 4 NREM
A)show delta waves.
B)are called paradoxical sleep.
C)consist of mostly beta waves and a few sleep spindles.
D)occur only during the last half of the night.

Question

Quizplus · Accepted Answer

Stage 3 and Stage 4 of NREM sleep are characterized by delta waves, which are slow waves indicating deep sleep. These stages do not show beta waves or sleep spindles (those are more typical of lighter sleep stages), are not called paradoxical sleep (that's REM sleep), and can occur throughout the night, not just in the last half.