Sleep spindles usually first appear in Stage __________ sleep.
A) 1
B) 2
C) 3
D) 4

Question

Quizplus · Accepted Answer

Sleep spindles are brief bursts of brain activity that typically last for 0.5 to 2 seconds and occur at a frequency of 11 to 16 cycles per second. They are most frequently observed in Stage 2 sleep, which is characterized by a slowing of brain activity, a decrease in muscle tone, and an overall decrease in physiological arousal. Sleep spindles can also occur briefly in Stage 3 and 4 sleep, but they are most prominent in Stage 2. Therefore, the correct answer is B (2).

Sleep Spindles Usually First Appear in Stage __________ Sleep