Diabetes. In a study of almost 9,000 Americans, researchers found a relationship between sleep and the risk of diabetes. People who slept more than nine hours each night had a 50% greater risk of diabetes than people who slept seven hours per night. This increased risk was also seen in people who slept less than five hours per night. The researchers did not draw conclusions about the physiological link between long sleep and diabetes. But they did suggest that oversleeping could be indicative of underlying medical problems that increase the likelihood of diabetes.
Obesity. Sleeping too much could make you weigh too much, as well. One recent study showed that people who slept for nine or 10 hours every night were 21% more likely to become obese over a six-year period than were people who slept between seven and eight hours. This association between sleep and obesity remained the same even when food intake and exercise were taken into account.
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