Sleep linked to slower ageing: huge study pinpoints the right amount

Getting roughly 6 to 8 hours of sleep each day has been linked with a longer life — at least in humans. Credit: Justin Paget/Getty A sweeping analysis of sleep duration and signs of ageing in half a million adults has pinpointed a sweet spot — about six to eight hours of sleep each day — that is linked to a lower risk of early death and disease. …