What are some natural ways to keep awake?

How do you keep awake when studying or doing homework? (e.g., taking a walk, etc.)...

frooliemew	sex
Ya Girl	try putting some spoons in the freezer (before you start studying) and put them over your eyes!
rybka	excercise like pushups or splash yourself with cold water
bnt	Coffee, Coffee, Coffee!
DJC	If you're tired you can't learn stuff or concentrate. If you're staying up to urgently finish homework, listen to music, drink something with caffeine/sugar in and breath deeply to get lots of oxygen to your brain!
Kendra	coffe... tanning.. running.... singing...
You Wish You Knew Me ;-)	sitting up straight in a room that isnt too warm..
(//-)	MONSTER! COFFIE! lol or just doing something that keeps u awake...uhhh cold water??
animal_mother	Do some jumping jacks. Drink coffee.
my new life	cool air,wash ur hair
jervel	i dont have a clue
moi	water or any of those diet pills that get you jumping off the walls!
TCBwithEP	Walking around briskly after sitting down for a long while helps shake off the sleepiness-I worked full time night shift as a day time nursing student and had alot of sleepy moments! I did the coffee thing but in the end I just felt nauseated or jittery but still exhausted. I relied heavily on Comprehensive Vitamin B oral drops and frequent small long lasting carbohydrate and protein snacks instead of larger meals to get through. Drinking alot of water helps fend off those dehydration headaches and dullness that accompany pulling long hours.