Due to that reasons, I have found out many useful techniques to stay awake at night/in class/during exam :P
Lets start with the first
1) Well people says that exercise allow us to be awake during the time. This keep our brain alert and awake. The following images are the type of exercise you do.
Sleeping is a good form of exercise :P what you expect?
Shooting like idiot... keep your awake.
Walk you dog is good for fresh air.
You could also ask others to help you ;)...
2) Computer games keep your mind ready for the next move..
Looks refreshing huh?
3) Eating keeps you awake ;)
Eating is good but don't overeat :p
4) Last but not least...
Sometimes unexpected event happens usually at night or by the time you almost fall asleep...
A feed from MSN :P