In which stage of sleep can you observe a person's eyes darting rapidly back and forth beneath their eyelids?

Question

Quizplus · Accepted Answer

Rapid Eye Movement (REM) sleep is the stage of sleep where rapid eye movements occur. Hence, option B is correct. In contrast, during Stage one, the brain produces alpha and theta waves, respiratory rates, heart rate, and muscle tension decrease, and the eyes move slowly. During stage two, brainwave frequency decreases, and slow-wave sleep begins, and during stage four, delta waves are produced, and it's the deepest stage of non-REM sleep.

In Which Stage of Sleep Can You Observe a Person's