Re: So.. I just drank one of those wee bottles "5 Hour Instant Energy.
I had one last year. A buddy was trying to get me to go out and I was tired, he happened to have one around because he pulls all-nighters a lot to work on projects. Honestly, I don't remember it being all that impressive. I did feel more alert to drive to the party, but as I remember it, the party was a bust and we ended up just hanging out at my place watching a movie. I might've stayed up later than I would have otherwise, but I wasn't running up any walls.
That being said, sometimes the body reacts to things differently at different times. I've been a little jittery lately, I feel like if I took that now, I'd end up jogging around my apartment complex trying to get to sleep.