MONTREAL –Middle-aged people who don't get enough sleep may have a higher risk of dementia 25 to 30 years down the line, a recent British study warns.
However, two Quebec experts consulted by The Canadian Press insist that doesn't mean that people in their 50s who get only five or six hours of sleep a night are automatically doomed to develop dementia by age 80, nor will those who get excellent sleep be automatically protected.
Sleep disorders and cognitive problems are multifactorial, they explain, and it can be very difficult to tell which is responsible for what.
The authors of the study, published in Nature Communications, followed some 8,000 people in the UK for 25 years, starting at the age of 50.
Subjects who consistently reported sleeping six hours or less per night were about 30 per cent more likely to be diagnosed with dementia some 30 years later, …