We’ve all heard the same advice about sleep for years and years now, haven’t we? We all need to get eight hours of it a night.
It’s become one of those unshakable health rules that sits alongside drinking more (and more) water and eating five portions of fruit and vegetables a day.
Most people accept it without much argument.
But a huge study suggests that the magic number may not actually be eight after all.
Researchers examined sleep data from around 500,000 people taking part in the UK Biobank, a long-running health project in Britain. They compared part...


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