Sleep Education

American Academy of Sleep Medicine 

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Advanced Sleep-Wake Phase – Symptoms & Risk Factors


Someone with ASP may:
  • Fall asleep during the late afternoon or early evening AND wake up too early while everyone else is still sleeping
  • Feel very sleepy in the late afternoon AND very alert between 2 a.m. and 5 a.m.
  • Have a natural “early bird” clock every night?
It is also important to know if there is something else that is causing your sleep problems. They may be a result of one of the following:
  • Another sleep disorder
  • A medical condition
  • Medication use
  • A mental health disorder
  • Substance abuse

Risk Factors

Advanced sleep-wake phase disorder is not very common. It is estimated to occur in only 1% of middle-age adults. It is more common in older adults and seniors. Men and women are affected at an equal rate. A genetic link has been shown in some families. This should be considered in younger patients. ASP may be caused, increased, or maintained by environmental factors. It can also result from outside social or work pressures.
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