Coffee: Usually good if my productivity is down, and I need something to get a jump start. I started drinking coffee lately, and my sad times have definitely decreased. Maybe they should start prescribing coffee for depression...
Saturn Rings/Peachy-O's: Just enough sugar to get me going, and think about how I got to NASA. You look up at the stars and wonder, "Who am I in this vast universe?". Just don't eat candy while you are hungry: It can cause major sugar crashes and headaches, which are never good.
Working Out/Dancing: Getting your adrenaline going often helps you to worry about something else. I love coming back from my modern class feeling better and ready to tackle my homework problems.
Chilling with Friends: Another diversion technique. Resist the urge to rant about your classes or he or she. Just sit around and watch stupid youtube videos. Or watch a movie, and make fun of the characters. Do something to get your mind off of school.
Sleeping can be evil sometimes. I'll lie awake, worried about everything. And in the morning I'll feel even more anxious than I am now.
What are you favorite stress relievers/pick-me-ups?