Which of the following statements regarding REM sleep is true? A. REM sleep occurs only during stage 4 sleep. B. REM sleep occur
s during stage 3 sleep. C. Dreaming causes major muscle contractions and tossing and turning. D. Roughly 20 percent of adult sleep time is accompanied by REM.
The answer is C. dreaming causes major muscle contractions triggered by the activation of the alpha motoneurons in the spinal cord.and tossing and turning.
