Sleep and Aging

Frequently Asked Questions

25. What is REM sleep behavior disorder?

Another condition that may make it harder to get a good night's sleep is rapid eye movement sleep behavior disorder, also known as REM sleep behavior disorder. It is somewhat more common in men over the age of 50.

REM sleep, or rapid eye movement sleep, is the most active stage of sleep when dreaming often occurs. During normal REM sleep, the eyes move back and forth beneath the eyelids, and muscles cannot move. In more severe forms of REM sleep behavior disorder, the muscles become quite mobile and sufferers often act out their dreams.