What is a defining criterion for insomnia?
A) a person who consistently feels sleepy during the day
B) consistently less than 6 hours of sleep per night
C) at least 50% less REM sleep than normal
D) more time spent in NREM sleep than in REM sleep

Question

Quizplus · Accepted Answer

Daytime sleepiness is a common symptom of insomnia, as it indicates that the person is not getting restful sleep at night.

What Is a Defining Criterion for Insomnia