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A long list of studies in recent years have linked Alzheimer's disease with a lack of sleep.
But getting too much shut-eye may also raise the risk of the cruel memory-robbing disorder, according to research.
Scientists - People - Hours - Night - Decline
Scientists found people who slept for nine hours or more per night showed a significant decline in memory and language skills, early markers of dementia.
Those who got less than six hours were also at risk, with researchers claiming the sleep sweet spot is seven to eight hours.
Experts - Shut-eye - Dementia - People - Disorder
Experts are unsure why too much shut-eye may cause dementia, but they say people at-risk of the disorder have disruptions in their brain which promote longer sleeps.
The team of academics from the University of Miami Miller School looked at 5,247 Hispanics over seven years.
Participants - Part - Hispanic - Community - Health
Participants, all aged between 45 and 75, were part of the nationwide Hispanic Community Health Study/Study of Latinos.
It included Latinos from diverse backgrounds in Chicago, Miami, San Diego and the Bronx in New York City.
Participants - Test - Start - End - Study
Participants were given a neurocognitive test at the start and the end of the study.
Researchers assessed their attention, memory, language, reaction time and perception to give a snapshot of their brain health.
Volunteers - Questionnaires - Sleeping - Habits - Days
Volunteers were also asked to fill out weekly questionnaires about their sleeping habits over the last seven days.
They were asked what time they normally go to bed, what time they usually wake up and if they had napped at any point during the day.
Fifteen - Cent - Participants - Average
Fifteen per cent of participants slept for an average of...
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