According to a recent study in which 10,000 civil servants aged 35-55years, whose sleep and health were monitored for 17 years, found that those who regularly sleep less than 5 hours or more than 9 hours at night had a 1.7% higher death rate from all causes, and more than double the risk from heart disease. It is known that 40% of the population in the U.S regularly sleeps less than 5 hours at night.

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