Nocturnal Paroxysmal Dystonia

**Definition:** A parasomnia characterized by paroxysmal episodes of choreoathetotic, ballistic, dystonic movements, and semipurposeful activity. The episodes occur during non-rapid eye movement sleep and typically recur several times per night. (Neurology 1992 Jul;42(7 Suppl 6):61-67; Adams et al., Principles of Neurology, 6th ed, p391)

**Tree numbers:** - C10.886.659.627 - F03.870.664.627

**Synonyms:** - Dystonia, Nocturnal, Paroxysmal - Hypnogenic Paroxysmal Dystonia - Sleep-Related Dystonia