Diagnostic Features

The essential feature of Circadian Rhythm Sleep Disorder is a persistent or recurrent pattern of sleep disruption that results from altered function of the circadian timing system…

Diagnostic Features

The essential feature of Breathing-Related Sleep Disorder is sleep disruption, leading to excessive sleepiness or, less commonly, to insomnia, that is judged to be due to abnormalities of ventilation during sleep (e.g.,…

Diagnostic Features

The essential feature of Primary Insomnia is a complaint of difficulty initiating or maintaining sleep or of nonrestorative sleep that lasts for at least 1 month (Criterion A) and causes clinically significant distress…

Narcolepsy is characterized by irresistible attacks of sleep during the day, resulting in brief but refreshing naps. In addition, several “accessory symptoms” can occur: cataplexy (brief episodes of sudden bilateral loss of muscle tone associated with…

The category of dyssomnia not otherwise specified is for insomnias, hypersomnias, or circadian rhythm disturbances that do not meet criteria for any specific dyssomnia. The most common of these conditions are restless legs…

Primary hypersomnia is characterized by excessive daytime sleepiness or prolonged nocturnal sleep that causes significant distress or social or occupational impairment. By definition, it does not occur during the course of another sleep disorder or…