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.
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.
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