A young woman covering her ears as her alarm goes off Rhythmic movement disorder is a rare motor disorder that results in frequent night sleep disturbances. Rhythmic movement disorder (RMD), a rare ...

A 10-month-old St. Johns girl is fighting a movement disorder so rare her doctors believe she may be the only one who has it, her moms said.

Tic disorders are conditions featuring sudden, non-rhythmic movements or vocalizations. A formal tic disorder diagnosis is determined by tic frequency, duration, and type. Tics are non-rhythmic ...