Sleeping Too Much or Too Little Could Increase Your Risk of Death and Dementia: Study
A new study from Kyushu University in Japan sheds additional light on the relationship between sleep time and the risk of both early death and dementia.
People who slept fewer than five hours or over 10 hours showed substantially elevated risk of early death and dementia than others.
Newsweek reports of the study:
Their study involved 1,517 elderly people without dementia in a Japanese community. The individuals were part of a group screened for dementia prospectively in the decade following 2002. Of the total participants, 294 developed dementia, and 282 died.
The individuals were asked to report how long they slept, and were categorized into five groups. Those who slept for fewer than five hours; between five and 6.9; seven to 7.9; eight to 9.9; and over 10.
The study also found that the consumption of sleeping pills increased risk of dementia and death while physical activity decreased risk.
Further study is needed to better illuminate the relationship between sleep time and sleep quality.
Dr. James Pickett, head of research at the U.K.-based Alzheimer’s Society, told Newsweek that "researchers at the [U.K.] Dementia Research Institute are looking at this relationship, delving not only into the importance of quality versus quantity of shut-eye, but also what happens in our brains when we get a good night’s rest."