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Daytime naps
could be early sign of dementia
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London, July 17 (IANS)
Napping frequently during daytime could be an early sign of
dementia, or may
even prompt it -- so beware, say neurologists.
They have
linked excessive sleep
and problems with thinking in the elderly.
Many older
people take 40 winks, and it is usually only because they need physical rest
from exertion.
But French
researchers who looked at results from 5,000 people over 65 years found the
fifth who regularly took long naps scored lower in
mental ability
tests, according to the Telegraph.
Claudine
Berr, from the Institut
National de la Sante et de la Recherche Medical (Inserm), told the
Alzheimer's Association International Conference in Vancouver: "These results
suggest that excessive
daytime sleepiness may be an early predictor of cognitive decline."
In another
study, also presented in
Vancouver, American researchers found that routinely sleeping more than
nine hours a night, or less than five, was linked to lower mental ability.
Elizabeth
Devore from the Brigham and Women's Hospital in
Boston, Massachusetts,
looked at 15,000 former nurses over 70.
She and
colleagues also found those who slept too much or too little exhibited chemical
brain changes indicative of early Alzheimer's, which is the commonest form of
dementia.
She said
that over time, "extreme sleep durations... may contribute to cognitive decline
and early Alzheimer's", and not simply be a passive sign of them.
Marie Janson
of Alzheimer's Research in Britain said: "There is already some evidence linking
sleep duration and disturbances to cardiovascular health and diabetes. So it is
not surprising to see studies examining how sleep might affect cognitive ability
over time.
( Courtesy:
http://in.news.yahoo.com/ )
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