Daytime drowsiness increases risk of Alzheimer's in elderly

CNN - Poor sleep and the risk of dementia go hand in hand, but no one knew which came first. 

In what researchers say is the first study of its kind, a study published Monday in the journal JAMA
Neurology shows that excessive daytime sleepiness in cognitively normal elderly leads to a buildup of a
plaque in the brain called amyloid.

Depositing amyloid in brain tissue is the first known preclinical stage of Alzheimer's and happens well before any obvious symptoms of dementia begin.

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