Staying awake on 4/20?

As you all know, today is 4/20. And at 4:20pm I will attempt the 420 challenge. For those of you who dont know what that is, it's where you have to sit down and smoke 4.20 grams by yourself in one session. I'm confident I can do it, but there's one problem. I get tired as hell when I smoke, and I usually end up falling asleep. I'm thinking about smoking it as fast as I can, but am wondering how I should do this? Should I roll a 4.2 gram blunt? What should I do to stay awake? Oh, and happy 420!!