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Poor Sleep May Age Your Brain
Date:7/16/2012

By Maureen Salamon
HealthDay Reporter

MONDAY, July 16 (HealthDay News) -- Evidence is building that poor sleep patterns may do more than make you cranky: The amount and quality of shuteye you get could be linked to mental deterioration and Alzheimer's disease, four new studies suggest.

Too little or too much sleep was equated with two years' brain aging in one study. A separate study concluded that people with sleep apnea -- disrupted breathing during sleep -- were more than twice as likely to develop mild thinking problems or dementia compared to problem-free sleepers. Yet another suggests excessive daytime sleepiness may predict diminished memory and thinking skills, known as cognitive decline, in older people.

"Whether sleep changes, such as sleep apnea or disturbances, are signs of a decline to come or the cause of decline is something we don't know, but these four studies . . . shed further light that this is an area we need to look into more," said Heather Snyder, senior associate director of medical and scientific relations for the Alzheimer's Association in Chicago, who was not involved in the studies.

The studies are scheduled for presentation Monday at the Alzheimer's Association annual meeting in Vancouver.

The largest of the studies, which examined data on more than 15,000 women in the U.S. Nurses' Health Study, suggested that those who slept five hours a day or less, or nine hours a day or more, had lower average mental functioning than participants who slept seven hours per day. Too much or too little sleep was cognitively equivalent to aging by two years, according to the research, which followed the women over 14 years beginning in middle age.

The study also observed that women whose sleep duration changed by two hours or more a day from mid- to later life had worse brain function than participants with no change in sleep duration -- a finding that held true regardless of how long
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