REM Sleep Behavior Disorder RBD is characterized by abnormal behaviors emerging during REM sleep that may cause injury or sleep disruption. A complaint of sleep related injury is common with RBD, which usually manifests as an attempted enactment of unpleasant, action-filled, and violent dreams in which the individual is being confronted, attacked, or chased by unfamiliar people or animals. Typically, at the end of an episode, the individual awakens quickly, becomes rapidly alert, and reports a dream with a coherent story. The dream action corresponds closely to the observed sleep behaviors.