Question

Which of the following is most accurate about a typical night's sleep?

A. The sleep cycle repeats itself every about 90 minutes.
B. During REM sleep the muscles are tense and brain waves reveal deep relaxation
C. As the stages of sleep progress, we eventually reach REM sleep and remain there until awakening the next morning
D. Most of a night's sleep is spent in Stage 4 and REM
E. Everyone needs 8 hours of sleep per night

Answer 1

A typical night's sleep consists of several stages, including REM sleep and NREM sleep. The sleep cycle repeats every 90 minutes, with NREM sleep preceding REM sleep.

Step-by-step explanation:

A typical night's sleep is composed of several different stages, including REM (Rapid Eye Movement) sleep and non-REM (NREM) sleep. During REM sleep, the brain waves resemble those observed when a person is awake, and dreaming occurs. In contrast, NREM sleep is divided into three stages, with stage 3 being the deepest stage characterized by delta waves. The sleep cycle repeats approximately every 90 minutes, with NREM sleep preceding REM sleep.