In the REM sleep cycle, the muscles are relaxed.
There are various cycles of sleep. Recall that sleep is a time when the activity of the body tends to become decreased. Now, during the REM sleep cycle, the activity of the brain tends to increase and become almost what it is when a person is awake.
At this point, a person can dream. However, the fact that the muscles relax makes the person not to act the things that happen in the dream. Thus in the REM sleep cycle, the muscles are relaxed.
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