1. 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.
2. The sleep disturbance causes clinically significant distress or impairment in social, occupational, or other important areas of functioning.
3. The disturbance does not occur exclusively during the course of another sleep disorder or other mental disorder.
4. 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.

Specify type:
Delayed sleep phase type: a persistent pattern of late sleep onset and late awakening times, with an inability to fall asleep and awaken at a desired earlier time
Jet lag type: sleepiness and alertness that occur at an inappropriate time of day relative to local time, occurring after repeated travel across more than one time zone
Shift work type: insomnia during the major sleep period or excessive sleepiness during the major awake period associated with night shift work or frequently changing shift work
Unspecified type