Named the previously unknown danger of prolonged sleep

Sleep, like everything else, good in moderation.

Harmful not only lack of sleep but excessive sleep. Researchers are advised to sleep seven to nine hours. Deviation in any direction is fraught with health. Moreover, not only physical, but also mental and mental.

A recent study researchers at Boston University indicate that people sleeping more than nine hours, increasing the likelihood of developing dementia, disease, reflected by reduced brain volume and a sharp decrease in intellectual abilities.

American scientists examined nearly 2.5 thousand people, whose average age was 72 years. Depending on the duration of sleep they were divided into three groups: short sleep – less than 6 hours per day, normal – between 6 and 9 and long – more than 9.

Study participants were interviewed about the duration of sleep twice, with an interval of 13 years. All this time for them to conduct observations. During 13 years were identified 234 cases of dementia and 181 the case of Alzheimer’s disease. It turned out that among patients with dementia slept more than 9 hours was twice as high. In addition, they have drastically decreased the volume of the brain and decreased intellectual capacity.

According to the world Health Organization (who), dementia is on the planet suffer 47.5 million people. Annually, doctors diagnose 7.7 million new patients. Alzheimer’s disease is the most common form of dementia, accounting for 60-70% of patients.

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