Weapon No.1 : The Coffee
Ahh, yes, the classic stimulant. But the true secret is not what coffee you drink, but rather how you drink it. My suggestion is that you first take in half a cup, as the loading dose. Then subsequently, after certain time intervals, you take in 1 mouthful. The idea is to find your "Coffee Steady State". Hence, the caffeine would not be too much as to cause you to get severe palpitations, and not too little as to lose its stimulant effect. But anyways, on days when you feel that you do not need coffee to keep you going, don't take any coffee! Surely you do not want to be desensitized to the coffee so early, especially if you are still a medical student and yet to start working as a doctor.
Weapon No.2 : The Face wash
Weapon No.3 : The Push-Ups and Sit-Ups
These will definitely make your heart go pounding strong again, and the best part about them is, they help you stay in shape too.
Weapon No.4 : The Psych up
Psych yourself up by either reminding yourself the ultimate reason you are studying, or if you are an asian, reminding yourself that your friends/competitors are studying harder than you.
Weapon No.5 : The Wind Oil
A western alternative to this would be something like Vicks, or anything that has eucalyptus in it.
How do you stay awake while studying? Please do share under the comments section, and let me update this list in the future.