Fueling yourself up with food and drink will help you stay awake and alert-- but you have to do it correctly or you may become sleepier. Here are some tips:
* Limit caffeine. Your first impulse may be to reach for a Red Bull or double espresso. Caffeine can help, but you really need to use it in moderation. After binging on caffeine, your body crashes, which means you might be in terrible shape later in the evening or during your exam.
* Limit carbs, especially sugar. Like caffeine, carbohydrates will give you an energy burst-- followed by a crash. It's tempting to pamper yourself through this long evening with a big fat brownie or something, but that's not going to help.
* Eat protein rich snacks.Protein will give you a more consistent source of energy without the crash. Try nuts, cheese, a meaty sandwich or wrap with minimal bread, or a low-sugar protein bar.
* Drink water When you work out, you need to drink water for stamina. Same with your study session.