The shorter days and colder weather of winter can make anyone feel down, especially if you live a long way from the equator. The reduced light, warmth, and color of winter can leave you feeling melancholy, irritable, or tired. But if these feelings recur each year, make it tough to function during the winter months, and then subside in spring or early summer, you may be suffering from seasonal affective disorder (SAD). Seasonal depression can affect your health, your relationships, and your everyday activities. But no matter how hopeless you feel, there are things you can do to keep your mood and life stable throughout the year.