Parasomnias are involuntary behaviors that occur during arousals from REM sleep or partial arousals from non-REM sleep. They include sleepwalking, confusional arousals, nocturnal seizures, sleep talking, sleep bruxism, bedwetting, night-terrors and rhythmic movement disorder.
Parasomnias affect approximately 10% of Americans and are most common in children. Often parasomnias run in families. They can be triggered by other sleep disorders as well such as obstructive sleep apnea and/or by various medications. Treatment is crucial since with parasomnias there is a risk of injury to oneself or another person.