Drowsiness, staring and other mental lapses may signal Alzheimer's disease

Cognitive fluctuations, or episodes when train of thought temporarily is lost, are more likely to occur in older persons who are developing Alzheimer's disease than in their healthy peers, according to scientists at Washington University School of Medicine in St. Louis. Cognitive fluctuations include excessive daytime sleepiness, staring into space and disorganized or illogical thinking.

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