What is Rapid Eye Movement (REM) Sleep Behavior Disorder ?

Rapid eye movement sleep behavior disorder is characterized by repeatedly waking up after REM sleep, which may include vocalizations or complex motor behaviors. For instance, a person might move one’s arms in a fighting manner because of fighting that is occurring within one’s dream. Other behaviors might include running, punching, thrusting, hitting, kicking, or falling out of bed due to physical movements.