After Carlos had been asleep for about an hour and a half,his heart began to beat faster,his breathing became fast and irregular,and his closed eyes began to dart back and forth.Carlos was most likely experiencing
A) N3 sleep.
B) sleep apnea.
C) narcolepsy.
D) REM (R)sleep.

Question

Quizplus · Accepted Answer

The symptoms described - rapid heart rate, irregular breathing, and eye movements - are hallmark signs of REM (Rapid Eye Movement) sleep, which is also known as dreaming sleep. During REM sleep, your brain is very active while your body is mostly paralyzed, and your eyes move quickly back and forth. This is in contrast to the deep, slow-wave sleep of N3, which has a more regular breathing pattern and no eye movements. Sleep apnea and narcolepsy may also disrupt sleep patterns, but do not specifically involve the characteristic symptoms of REM sleep.

After Carlos Had Been Asleep for About an Hour and a Half,his