Circadian Rhythm Sleep-Wake Disorder, Advanced Sleep Phase Type

Circadian Rhythm Sleep-Wake Disorders, Advanced Sleep Phase Type is a circadian rhythm sleep-wake disorder characterized by sleep-wake times that are several hours earlier than desired or conventional times.

  • The prevalence of advanced sleep phase type is around 1%.[1]
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.

Advanced sleep phase type specifier

Specify whether:

  • Advanced sleep phase type: A pattern of advanced sleep onset and awakening times, with an inability to remain awake or asleep until the desired or conventionally acceptable later sleep or wake times.
    • Specify if:
      • Familial: A family history of advanced sleep phase is present.

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.
  • Late evening exposure to 10000 lux for 30 minutes.
For Patients
For Providers
1) American Psychiatric Association. (2013). Diagnostic and Statistical Manual of Mental Disorders (5th ed.). Arlington, VA.