Article: Sleep needs may be controlled biologically.(find researchers at the National Institute of Mental Health)

You cannot fool "Mother Nature' when it comes to how much sleep a person requires, according to a recent study (Journal of Clinical Endocrinology and Metabolism, January 2003). Researchers at the National Institute of Mental Health in Bethesda, Maryland, found that sleep needs vary according to individual factors programmed by the body's internal clock.

"Our study shows that the body's internal clock programs a longer biological night in long sleepers than in short sleepers," said Dr. Daniel Aeschbach, lead author of the study at Brigham and Women's Hospital and Harvard Medical School in Boston. "Thus, individual differences in the clock's program may contribute ...

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