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Sleeping for nine hours a night could be as bad for your memory as only getting five.
It is well known that people who sleep fewer than five hours a night can expect memory problems. But a study found the same effects in those who get a healthy-sounding nine hours a night.
The article goes on to state the following:
Researchers looked at memory test results for almost 400,000 people who were asked to match six pairs of hidden cards after memorising their positions.
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