Behavior: Sleep and Emotions

Ninety-five percent of adult Americans average seven to eight hours a night. The rest seem to need more than nine hours, or get along nicely on less than six. What distinguishes the long and short sleepers from the majority?

To get some answers, Psychiatrist Er nest L. Hartmann, 36, advertised in Bos ton and New York papers for long and short sleepers to engage in an eight-night "sleep-in" at Boston State Hos pital's Sleep and Dream Laboratory, which Hartmann directs. His findings in dicate that such people differ from or dinary sleepers — and each other — not so much physically as...

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