Harvard professor 'debunks myth' that you need eight hours of sleep

It's one of the most common tips for a good night's rest: hit the sack for at least eight hours a night. But a Harvard University professor claims that eight isn't the magic number.

Dr Daniel Lieberman, from the university's Department of Human Evolutionary Biology, said that 'people actually do better if they sleep for seven hours.'

'This idea that has been around for a long time, basically since the industrial revolution,' he said last week on an episode of the podcast Diary of a CEO.

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