sleep disorder primary sleep disorder: dyssomnia This section includes: - Primary Insomnia.- The essential feature of this disorder is a complaint of difficulty initiating or maintaining sleep or of nonrestorative sleep that lasts for at least one month. - Primary Hypersomnia.- The essential feature of this disorder is excessive sleepiness for at least one month as evidenced either by prolonged sleep episodes or by daytime sleep episodes occurring almost daily. - Narcolepsy.- The essential feature of this disorder are repeated irresistible attacks of refreshing sleep, cataplexy, and recurrent intrusion of elements of rapid eye movement (REM) sleep into the transition period between sleep and wakefulness. - Breathing-Related Sleep Disorder.- The essential feature of this 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. - Circadian Rhythm Sleep Disorder.- The essential feature of this disorder is a persistent or recurrent pattern of sleep disruption that results from altered function of the circadian timing system or from a mismatch between the individual's endogenous circadian sleep-wake system and exogenous demands regarding the timing and duration of sleep. - Dyssomnia Not Otherwise Specified.- Is a category for insomnias, hypersomnias, or circadian rhythm disturbances that do not meet criteria for any specific Dyssomnia. DSM-IV-TR (american Psychiatric Association) 307.42 Primary Insomnia 307.44 Primary Hypersomnia 347.00 Narcolepsy 780.57 Breathing-Related Sleep Disorder 327.3x Circadian Rhythm Sleep Disorder 307.47 Dyssomnia Not Otherwise Specified F51.0 Primary Insomnia F51.1 Primary Hypersomnia G47.4 Narcolepsy G47.3 Breathing-Related Sleep Disorder F51.2 Circadian Rhythm Sleep Disorder F51.9 Dyssomnia Not Otherwise Specified Primary disorders of initiating or maintaining sleep or of excessive sleepiness and are characterized by abnormalities in the amount, quality or timing of sleep. DSM-IV-TR (american Psychiatric Association) disomnias