The stage of sleep in which delta waves begin to appear is __________ sleep.
A) stage 1
B) stage 2
C) stage 3
D) stage 4

Question

Quizplus · Accepted Answer

Delta waves are slow, high amplitude brain waves that are characteristic of stage 3 and 4 of NREM (non-rapid eye movement) sleep. Stage 1 and 2 are characterized by slower alpha and theta waves, while stage 4 is the deepest stage of sleep with the highest percentage of delta wave activity.

The Stage of Sleep in Which Delta Waves Begin to Appear