A lack of deep sleep has been linked to less sensitivity to insulin and higher risk of diabetes in a U.S. study of healthy young adults.

The study, published in the early edition of the Proceedings of the National Academy of Science and available online, found young healthy subjects needed more insulin to dispose of the same amount of glucose after their deep -- or slow wave -- sleep was suppressed for three days. The decrease in insulin sensitivity was comparable to that caused by gaining 20 to 30 pounds.

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