DSM-IV: Dyssomnias
A primary [sleep] disorder of initiating and maintaining sleep or of excessive sleepiness. The dyssomnias are disorders of sleep or wakefulness per se, not a parasomnia.*
These include the following specific disorders: Breathing-Related Sleep Disorder | Circadian Rhythm Sleep Disorder | Hypersomnia | Hypersomnia Related to Another Mental Disorder | Insomnia | Insomnia Related to Another Mental Disorder | Narcolepsy
Also: intrinsic sleep disorders
American Psychiatric Association: Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition. Washington, DC, American Psychiatric Association, 1994
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*Reprinted with permission from: Culebras, Antonio Clinical Handbook of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann