Found that sleep too long or too short increases the risk of causing an early death.

Author opening - Kapputsio Francisco. There were 10 308 Britons surveyed from 1985 to 1988 and from 1992 until 1993.

Adult need to sleep 7 hours. If the rest 8 hours or more, the probability of dying in the next 11-17 years increased at twice. Strangely enough, but the most likely cause of death will not serdechnososudistye disease. Depression, low social status and SS disease exacerbate the situation. If 5 hours sleep, then the risk of dying goes up 1.7 times, and the development of diseases SS - 2 times.

If you sleep less than 7 hours, it may:

* Increase the weight;
* Develop hypertension;
* Appear type 2 diabetes.

Not yet proven that sleep longer than 7 hours - leading to increased mortality, although the result of the study said the opposite. The reasons may be depression, low social status, etc.

It turns out that now refuted rule of Eight, known in the domestic medicine: you have to sleep 8 hours, 8 and 8 rest work for the preservation of health. But I’m having doubts about the theory that increasing the duration of sleep from 7 to 8 in subsequent years, provoking death. From what should be one event after another in time, we can not conclude that one - another reason. There are many factors, and only their cumulative effect, I would be considered as the main reason, how much people live. In addition, there is the assertion that the body itself knows that better for him. How can be those people who feels badly that 7 hours - little?

One thing is clear: according to the study adults better sleep 7 hours a day to prevent the increasing number of diseases and preserve health. No more, no less.