Lack of sleep after middle age awakens dementia


PARIS – Sleeping six hours or less per night between the ages of fifty and seventy has been linked to an increased risk of developing dementia, according to a new study that has followed nearly 8,000 British adults for more than 25 years.
The study, published Tuesday in the journal Nature Communications, showed that the risk of developing dementia is 20 to 40 percent higher in people who sleep for a short period, and whose sleep duration is six hours a night or less at the age of fifty or sixty, than in people who sleep for a short period of time. Those who spend “normal” nights sleeping at least seven hours.
This study, issued by the French National Institute of Health and Medical Research and the University of Paris in cooperation with the University College in London, concluded that there is a link between sleep duration and the risk of developing dementia, but it did not reach a confirmation of the cause-effect relationship.
Researcher Severin Sabya and colleagues also note that the risk of developing dementia is 30 percent higher for people between the ages of 50 and 70 who sleep systematically for a short period of time, regardless of their potential cardiovascular health problems, metabolism or depression, which are risk factors for dementia.


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