Circadian rhythm sleep disorder - causes, DSM, functioning, effects, therapy, adults, examples, person: "The Fourth Edition Text Revision of the Diagnostic and Statistical Manual of Mental Disorders ( DSM-IVTR , a handbook used by mental health professionals to diagnose mental disorders) defines circadian rhythm sleep disorder as one of several primary sleep disorders . Within the category of primary sleep disorders, it is classified as one of the dyssomnias, characterized by irregularities in an individual's quality, timing, and amount of sleep. In earlier versions of the DSM , the disorder is called sleep-wake schedule disorder.
Description
Circadian rhythm sleep disorder involves an alteration of an individual's circadian system or a mismatch between a person's natural, or endogenous, circadian system and the external, or exogenous, demands placed on it. It can lead to insomnia at certain times of the day or excessive sleepiness throughout the day. The insomnia or excessive sleepiness results in impaired functioning in social, occupational, or other environments."
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