Why not in any case can not sleep for a long time, the scientists told.

Japanese scientists found that too short or too long a dream increases the risk of dementia and premature death in people over 60 years of age.

The study involved 1517 people, followed for 10 years. During this time, 294 volunteers developed dementia, and 282 died.

The incidence of dementia and mortality, calculated with an adjustment for age and sex, was higher in those who slept less than five hours or more than 10 hours a day, compared with those who had a sleep of 5-6.9 hours.

The article is published in the Journal of the American Geriatrics Society, writes EurekAlert!.

However, high physical activity in the elderly compensated for the negative effect of non-observance of sleep hygiene, reducing the likelihood of senile diseases.

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