And if you're like me, and leave your brain hurting for too long, you are rewarded with a nice fat migraine. I've found the only thing that stops a caffeine migraine is 1 Maxalt, 2 Advil, and a large quantity of the caffeine delivery system of your choice.

You get headaches from caffeine withdrawal because the caffeine either dilates the blood vessels in your brain. When the caffeine gets shut off, the blood vessels go funny and cause the headache. That's why 'headache medicines' are half asprin and half caffeine.