Dementia risk in too much sleep

Older adults who started sleeping more than nine hours a night — but had not previously slept so much — were at more than double the risk of developing dementia a decade later than those who slept nine hours or less, researchers report.

The increased risk was not seen in people who had always slept more than nine hours.

“We’re not suggesting you go wake up Grandpa. We think this might be a marker for the risk of dementia, not a cause” of the illness, said Sudha Seshadri, a professor of neurology at Boston University School of Medicine and the senior author of the study, in Neurology.

Using data from 2,457 people, average age 72, who were part of a study in Framingham,Massachusetts, the researchers found that those with a new habit of excessive slumber were at a greater risk of all forms of dementia, including Alzheimer’s, which is characterised by a build-up of beta amyloid, a toxic protein fragment that forms plaques in the brain.

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