Red Bull + Caffeine Gum. You can buy the gum at Target. Worst tasting gum in the world, but the chewing plus shot of caffeine and the after taste will keep you wired for any meeting.
1. Get two needles. 2. Find a trustworthy co-worker 3. Tell him your situation and ask him to poke you with the needle everytime you drift off and you do the same for him. 4. Make sure the co-worker sits next to you. Now you will either stay awake at the fear of being stung by a needle or be poked awake painfully. You're welcome
I seriously do this from time to time: (1) put hand to mouth and chin as if really thinking, and nod head (2) bite the crap out of a finger. Endorphins will jolt you awake. Just don't break the skin. Why does this make me sound like one messed up dude?