Obeybunny (Santa Ana, California, United States Of America) on 12/29/2011:

Here is what you do. Rub the undersides of your eyes with cold water. In 3 seconds, you'll be wide awake.

It doesn't need to be a violent splash of water on your whole face like they do in the movies, a simple damp wash cloth will do.

---

Obviously, make sure you get at least 6 hours of sleep within each 24 hour period. It might also help if you don't eat sugary foods (or foods that quickly turn to sugar in your bloodstream like bread). You can also try sleeping on a more comfortable mattress, sleeping to the sound of a fan (if little noises that are amplified by your bedrooms' dead silence are keeping you awake), and taking Melatonin (melatonin is healthier than a sleeping pill, less addictive, and impossible to commit suicide with) to ensure that you are getting enough restful sleep during the night.