How do you stay awake (long drive)?

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How do you keep yourself awake and alert on long solo drives?

I play CD's and sing like a fool, drink Coke or Dr. Pepper, stop often at McDonalds for more pop and a walk and the bathroom (highway rest stops make me nervous when I'm driving alone) and sometimes *gasp* call someone on my cell and ask them to talk to me. I use a head-set, both hands on the wheel.

I do NOT use cruise control!

Oh, and I drive with the window open. That might give me lower gas mileage, but it's worth it to keep me awake.

I think it's easier to stay awake on a bike ride...

Did ya do my cards this morning or do you have a crystal ball too? Exactly what I did this morning on the way to my ride in DE. Except the McD's. Blech.
Yep, sang like a fool the whole way and drank a Pepper. Funny, I only started drinking those recently. Never liked them as a kid. I really wanted an A&W, but they only had diet. I was about to put the top down just to get enough air. Whew! Seriously sleepy for a while until I got my second wind.