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ÃÛÑ¿´«Ã½,1 min
ÃÛÑ¿´«Ã½ Minute: On the world's largest sleep study
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Scientists in Canada are studying the sleeping patterns of over a 100,000 people around the world to find out things like, how much sleep is 'enough' sleep? And how sleep deprivation affects our cognitive behaviour. ÃÛÑ¿´«Ã½'s Medical Correspondent Fergus Walsh went to Canada to find out more about it. Photo: A photo of a woman sleeping, Credit: Getty Images
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