I don't do energy drinks or coffee. If I really have to get going, I can usually kick myself into wide-awake mode. Or turn on the hot water on the sink and let my hands in it, enough to were the neurons in my head kick in and then I'm wide awake; that's an extreme case. When it's one of those days when it just doesn't seem to end, I pace around endlessly if possible or try some other physical movement to keep myself from dropping dead asleep.

Sour food/drinks/tequila works too.