If you're the kind of person whose idea of winter is hibernation, lots of TV and frequent crying, you might suffer from the winter blues. While a little of all that isn't a bad thing, falling into a seasonal depression can wreak havoc on your life. You can avoid it if you start making changes now, before the sadness seeps in. Since the days are still long (enough), these changes will pay off in the year's shortest days.
Start by getting up with the sunrise. This maximizes your exposure to the daylight hours. The move also makes you feel less guilty for going to sleep early, which you might have done anyway through winter.