Poor sleep at night increases dementia risk in elderly

Older adults who get a good night’s sleep with the least disturbance and are able to dream well may be at a lower risk of developing dementia later, says new research.

The study shows that spending less time in REM sleep, which is we dream the most, and taking longer to enter REM sleep can both raise the risk of dementia.

Each percentage reduction in REM sleep was associated with a 9% increase in the risk of all-cause dementia and an 8% increase in the risk of Alzheimer’s disease dementia. The team studied 321 participants over the age of 60.

Previous study had shown that people who consistently sleep more than nine hours each night had double the risk of developing dementia in 10 years as compared to participants who slept for nine hours or less.

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