REM sleep is sometimes called 'active sleep' for all the following reasons EXCEPT:
A) heartbeat is fast and irregular during REM sleep
B) brain activity is intense during REM sleep
C) vivid dreams occur during REM sleep
D) the activity of skeletal muscles increases during REM sleep

Question

Quizplus · Accepted Answer

The activity of skeletal muscles actually decreases during REM sleep, so option D is the only one that does not correctly describe why REM sleep is called 'active sleep'.

REM Sleep Is Sometimes Called 'Active Sleep' for All the Following