Rhythmic movement disorders encompass repetitive, stereotyped gross-motor actions that occur at sleep onset or during sleep and may interfere with restorative rest or cause injury. Typically emerging ...

Advanced sleep phase disorder is a rare condition that causes your natural circadian rhythm, or sleep-wake cycle, to occur earlier than typical. As humans, our sleep-wake cycle— also known as our ...

Stereotypic movement disorder is a motor disorder that develops in childhood, typically before grade school, and involves repetitive, purposeless movement. Examples of stereotypic movements include ...