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People who sleep five or less hours per day, live less than those who sleep seven hours, assert the British scientists. Surplus of sleep is not less harmful: people spending in a bed eight and more hours, die earlier.

Scientists from Worweek University and the London Imperial College used the data on the durations of sleep of 10308 state civil employees gethered in 1985-1988, and updated in 1992-1993. Supervision over participants was kept within 17 years.

Having analyzed the available data for the specified period, researchers have found out, that people, who slept for five and less hours in a day, 2 times more often died from cardiovascular diseases. As a whole, the death rate in this group was 1,7 times higher, than in a group of the employees sleeping for seven hours a day.

Want of sleep was associated with the increased risk of putting on weight, hypertension and diabetes of the 2 type, informed one of the authors of the research Francesco Kappuchio.

At the same time scientists have paid attention, that among those who slept for eight and more hours, the death rate was also twice higher, than among people, sleeping for seven hours a day.

Researchers could not explain this dependence, however have assumed, that long sleep can be a sign of depression, or breakdown typical for oncological diseases.