I have extreme delayed sleep phase disorder (DSPD), a circadian rhythm disorder (CRD). I fall asleep at dawn and wake up early afternoon. My dim light melatonin onset (DLMO) is at 5:30 am. A normal person’s DLMO may be at 9 pm, for example. CRD treatment—prolonged bright light after temperature nadir, dark restriction/melatonin starting several hours before natural bedtime, darkness till temperature nadir—does not work ...more »
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