A sleep doctor has revealed how switching from Daylight Savings Time to Standard Time can impact your health and how best to deal with a lack of sunlight in winter. Adrian Pristas, M.D., Sleep Medicine Director at Hackensack Meridian Health in New Jersey, explained how setting clocks back an hour on Sunday morning (November 1) can affect your body’s natural rhythms. Dr Pristas also revealed the best way to combat a lack of sunlight during the short winter days.