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If you've ever wondered why some people find it so easy to bounce out of bed and not hit the snooze button repeatedly, new scientific research is showing that it's down to your genes. A study by the University of Exeter Medical School looked at data from 700 thousand people, concluding that significantly more genetic factors are tied to when people sleep and wake. There are also mental health implications for people who sleep in. Professor Timothy Grayling is part of the team which undertook the research and he explains what they've discovered.
