leep to Your Own Rhythm
If you find yourself awake and energetic late at night, you may have a genetic mutation. The altered gene may explain why some people prefer late nights. This gene affects the body's circadian cycle-the clock that keeps our metabolism, digestion, and sleep patterns in sync. Researchers discovered abnormally long circadian rhythms in some mice-lasting about 27 hours instead of the normal cycle of 24 hours. These mice had the mutated gene. Also, night owls who compensate by staying in bed longer still experience more insomnia than the rest of us. Also, night owls report feeling less in control of their sleep, which may also fuel insomnia.
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http://health.msn.com/centers/sleep/articlepage.aspx?cp-documentid=100172163>1=10611