By Victoria Allen Science Correspondent For The Daily Mail
Published: 01:48 BST, 25 May 2019 | Updated: 01:48 BST, 25 May 2019
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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.
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.
Stock photo: 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
Compared to people getting seven hours of sleep, those who reported
