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 mi…

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 mi…

