Functioning on a measly four hours of sleep a night used to be a badge of honour for high-powered CEOs and world leaders.
Part of Margaret Thatcher's fearsome reputation came from how little she slept. Donald Trump used to brag that some nights he would only get three hours.
But a wealth of scientific studies in recent years have unequivocally shown that not getting enough shut eye can lead to a host of life-threatening diseases.
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