Which of the following statements about REM sleep is TRUE?

Question

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During REM sleep, the eyes move rapidly back and forth, which is why this stage is sometimes called rapid eye movement sleep. This is also when most dreaming occurs, but not all dreams happen during REM sleep.

Answer: C
 During REM sleep, the body experiences a loss of muscle tone or atonia, which means that voluntary muscles, including the diaphragm, nasal membranes, and erectile tissue, cannot move. This can cause sleep apnea in some people.

Answer: D
 REM sleep occurs in cycles throughout the night, but the length of time spent in each cycle changes as the night progresses. In the first cycle, REM sleep typically lasts for a shorter amount of time, but it becomes longer in later cycles.

Which of the Following Statements About REM Sleep Is TRUE