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Hit the sleep ‘sweet spot’ to keep brain sharp

Older adults who sleep short or long experienced greater cognitive decline than those who sleep a moderate amount, even when the effects of early Alzheimer’s disease were taken into account, according to a study by researchers at Washington University School of Medicine in St. Louis. (Photo: Getty Images)
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Like so many other good things in life, sleep is best in moderation. A multiyear study of older adults found that both short and long sleepers experienced greater cognitive decline than people who slept a moderate amount, even when the effects of early Alzheimer’s disease were taken into account. The study was led by researchers at Washington University School of Medicine in St. Louis.