Framingham Heart Study
Excessive Sleep Is a Sign of Dementia; Here Are Other Symptoms
Excessive sleep is a symptom of dementia, but not the cause of dementia, researchers have found. The new study also found that people who sleep for over 9 hours every day increase their risks of developing dementia two fold within 10 years. And then, MRI scans of the brain reveal that people who sleep in excess of 9 hours daily have smaller brain volumes compared with those who sleep less.