I just stay awake. It's rare that I have trouble staying awake. I can get really tired but if I want to stay up, I just power through it, I guess.

The easiest way for me to remain awake is to be on the phone to friends or family. I just get really happy when I'm talking with people, I guess. The more I care about them and the less often I see them, the more adrenaline will just keep me going.

As a last resort, yeah, sugary or caffienated juice/soda drinks can do it.