A night-school student who falls asleep in class sleeps for about 25 minutes before his professor notices and tries to awaken him. At this point, he is in such a deep sleep that it is almost impossible to awaken him. A brain scan would show his brain producing delta waves. He is probably in ________ sleep.

Question

Quizplus · Accepted Answer

The description of the deep sleep, the length of time the person has been sleeping, and the presence of delta waves in the brain scan indicate that the person is in Stage 4 sleep. Stage 4 is the deepest stage of non-REM sleep, characterized by slow, high-amplitude brain waves. The other stages of sleep do not produce delta waves or the deep level of sleep described in the scenario.

A Night-School Student Who Falls Asleep in Class Sleeps for About