What is it?

Delayed sleep phase, also known as delayed sleep-wake phase sleep disorder is a sleep disorder affecting the circadian rhythm, which is our internal clock. This means that the people who have it want to go to sleep two hours later than most people and wake up two hours later.

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Circadian rhythm sleep disorder, delayed sleep phase type.


Diagnosis is based upon findings from medical history and physical examination. Further evaluation may include actigraphy which is a device that tracks sleep-wake behavior, sleep diary, and polysomnogram.


Treatment may include a plan to improve sleep habits, melatonin supplements, light therapy, and chronotherapy.

☝️ This is not a substitute for professional medical advice. Please consult with your physician before making any medical decision.

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