Slideshow

7 Things to Know About Parasomnias

Nightmare disorder can produce emotional manifestations of fear, anger, and sadness. Here are 7 reasons parasomnias can challenge even the most astute diagnostician.

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Parasomnias are undesirable physical, experiential, or behavioral phenomena that occur exclusively during sleep onset, during sleep, or during arousals from sleep. In DSM-5, the parasomnias are non–rapid eye movement (NREM) sleep arousal disorders (sleepwalking, sleep terror types), nightmare disorder (formerly known as dream anxiety disorder), and rapid eye movement (REM) sleep behavior disorder (RBD). Interested readers may refer to Parasomnias: What Psychiatrists Need to Know, on which this slideshow is based. ©MarcosMesaSamWordley/Shutterstock

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