Make the most of your time outside of work. The aspect of the day encourages your playful side. Watch movies that lighten the spirit, play with children every chance you get, play with adults when there aren't any kids around, if possible, and most importantly, exercise! Nothing brings the spirits up more than moving your body in aerobic exercise. Oxygenated blood is the best anti-depressant around - and you can't get it sitting on the couch! You can choose your favorite form of exercise, so enjoy it.