Dyssomnias are sleep disorders involving undesirable physical arousal, behaviors, or events during sleep or sleep transitions, and include sleep terrors, sleepsex, sleepwalking, sleep-related eating disorder, and REM sleep behavior disorder.

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Dyssomnias are sleep disorders related to the amount, quality, or timing of sleep, including insomnia, narcolepsy, and sleep apnea, not disorders involving undesirable physical behaviors or events during sleep, which are classified as parasomnias.

Dyssomnias Are Sleep Disorders Involving Undesirable Physical Arousal, Behaviors, or Events