Circadian Rhythm Sleep-Wake Disorder, Shift Work Type

Circadian Rhythm Sleep-Wake Disorder, Shift Work Type is a circadian rhythm sleep-wake disorder characterized by a history of an individual working outside of the normal hours (i.e. - 8:00 A.M. to 6:00 P.M) on a regular schedule. Individuals will have symptoms of excessive sleepiness at work, and sleep impairment at home.

  • The prevalence is around 5 to 10% of night shift workers
Risk Factors
Criterion A

A persistent or recurrent pattern of sleep disruption that is primarily due to an alteration of the circadian system or to a misalignment between the endogenous circadian rhythm and the sleep-wake schedule required by an individual’s physical environment or social or professional schedule.

Criterion B

The sleep disruption leads to excessive sleepiness or insomnia, or both.

Criterion C

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

Shift work type specifier

Specify whether:

  • Shift work type: Insomnia during the major sleep period and/or excessive sleepiness (including inadvertent sleep) during the major awake period associated with a shift work schedule (i.e., requiring unconventional work hours).

Length Specifier

Specify if:

  • Episodic: Symptoms last at least 1 month but less than 3 months.
  • Persistent: Symptoms last 3 months or longer.
  • Recurrent: 2 or more episodes occur within the space of 1 year.
For Patients
For Providers