Haha, you have got to trust me on this. Coffee, soda, even energy drinks will make you CRASH. You may stay awake for a short while but if you want to stay up late enough to study, you should opt for an apple and constant water refills (cheaper & healthier).

Even sunflower seeds or something to keep your mouth busy will keep your mind away from sleeeep. Try to stay away from the chocolate too-calories, calories.

Get up every once in a while to stretch or to get some water / bathroom breaks. SPLASH WATER ON YOUR FACE!

If you are working on a long task, split it up into sections so you feel rewarded when you are finished each part. ACCOMPLISHMENT IS STIMULATING!

yeah anyway hope that helps, sorry if my caps intimated you haha

and fresh air lots maybe do some work out side and if you life neer the sea try to avoid