Go figure...

It's almost 3 AM and I'm wide awake. Why is it, that during midterms and finals I drank Red-Bull in the hopes of staying awake to "study" til the early morning hours, only to go to bed around my usual bedtime. But now I have 1 can of Diet Mountain Dew at 10 PM and it keeps me up this late... At least I have an afternoon shift tomorrow.