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Circadian Rhythm Sleep Disorder
Symptoms

A persistent or recurrent pattern of sleep disruption leading to excessive sleepiness or insomnia that is due to a mismatch between the sleep-wake schedule required by a person's environment and his or her circadian sleep-wake pattern.

The sleep disturbance causes clinically significant distress or impairment in social, occupational, or other important areas of functioning.

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The disturbance does not occur exclusively during the course of another Sleep Disorder or other mental disorder.

The disturbance is not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication) or a general medical condition.

Criteria summarized from:
American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders, fourth edition. Washington, DC: American Psychiatric Association.

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