More sleep and more exercise. And, at this time of year, a shot of natural outside daylight in the mornings (preferably combined with the exercise). Sorry, but there's no miracle solution. Trust me, I'm a health journalist. People will come on this thread saying Give Up This or Try That, but whether or not you ditch bread/sugar/carbs/booze/anything else, you need more sleep and more exercise. Water and fruit won't do it either.