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Study: Sleeping for 9 hours or more each night is linked to dementia
Researchers looked at 5,247 Hispanic participants, all between the ages of 45 and 75, assessing their attention, memory, language, reaction time, and perception. Participants were also given a neurocognitive test at the start and end of the study, and were asked to fill out weekly questionnaires about their sleeping habits over the last week, including what time they normally go to bed, what time they wake up, and if they have any naps during the day. Just 15% of participants slept for an average of nine hours each night, and this group saw their cognitive performance across all fields fall by the end of the seven years. Their memory decreased by 13% while their word fluency dropped by 20%.
Dr Ramos, a neurologist and sleep expert at the University of Miami, said: 'Insomnia and prolonged sleep duration appear to be linked to a decline in neurocognitive functioning that can precede the onset of Alzheimer's disease or other dementias. 'We observed that prolonged periods of sleep and chronic insomnia symptoms led to declines in memory, executive function and processing speed. 'Those measures can precede the development of mild cognitive impairment and Alzheimer's disease.' 'We may also be able to identify at-risk patients who may benefit from early intervention to prevent or reduce the risk of dementia.'
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