Sleepy??

Usually I stand up, take a walk to the bathroom, wash my face with cold water, drink a coffee - Italian coffee (an "espresso" as we call it here in Italy), if there is a window, go close to the window and breath some fresh air...then go back to the desk! Btw, If it doesn't work you can always ask someone to throws a glass of icy water down your neck...

drink a cup of coffee or do some exercises

I usually take a 15 minute power nap -- it works, I feel very awake after just 15 minutes. . I do this at work often. . .Then I will drink an energy drink, coffee, or some form of caffiene to stay awake, I find I can accomplish more this way. Good luck staying awake

Well, most of the time, I end up dosing off, especially when reading and I end up feeling sad, depressed and torn apart when I wake up and find out that I have actually missed out some hours.

i have a cup of tea to be awake especially when i have exams it helps to be awake late at night wat do other do every one has his own way

There's a new invention called coffee, you should try it, people say it makes you feel more awake! just kidding, I just run in circles until I feel more awaken.

I'll get up from my desk and take a walk to the restroom and do some stretching exercises. Otherwise, I'll pop a strong mint candy to perk myself up. Alternatively, I'll call my close friend and usually she'll have some jokes to share. The best ways to resolve this is not to over-eat during lunch break and have enough sleep.