This Chicago Tribune article, entitled "
Alzheimer's: Trouble Sleeping Could Affect Memory Later on, Study Finds" reports on a small study of 100 patients that found that those who had significant difficulty staying asleep (e.g., multiple awakenings during the night) also demonstrated the brain changes that are consistent with Alzheimer's-type dementia. This study is correlational -- do you think that lack of sleep impacts brain disease, or that brain diseases causes impairment in sleep? How could correcting sleep disturbance possibly impact cognitive impairment in late life?
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