Do we really need eight hours sleep a night – and what happens if we don’t get it?

‘O nce, after I did a presentation, someone came up to me and said, ‘I don’t get eight hours of sleep a night. Am I going to die?’” says Prof Russell Foster, head of the and Circadian Neuroscience Institute at the University of Oxford. “And I said, ‘Well, yes, you’re going to die. But, you know, we...

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