From Dr. Rotenberg...
Delayed Sleep Phase Syndrome
What is delayed sleep phase disorder?
Delayed sleep phase disorder is a sleep disorder in which the person’s sleep-wake cycle (internal clock) is delayed by 2 or more hours. Basically, because of the shift in the internal clock by two or more hours, the ability to fall asleep is also postponed. For example, rather than falling asleep at 10 PM and waking at 7 AM, an adolescent with delayed sleep phase disorder will not fall asleep until 12 or 1 AM and then has great difficulty awakening at 7 AM for school or work. If the child or adolescent is allowed to sleep until late in the morning, he will feel rested and can function well. Most children and adolescents with delayed sleep phase disorder describe themselves as “night owls” and usually feel and function their best in the evening and nighttime hours. They usually get much less sleep on weekdays compared to weekends or holidays....
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