Caffeine

So.....why is it that whenever you drink caffeine to try and stay awake for something important it never works, and then when you have a little bit with your dinner it keeps you up all night??? I guess I will never figure it out. When I used to work at the Delta Center, some nights I would be so tired that I would drink lots of caffeine just so I could stay awake to drive home and it never worked. I would still be so tired and have the hardest time making it. Tonight, I had a little cup of Dr. Pepper with my dinner not thinking anything about it and now my babies are both asleep and I should be getting sleep and I can't!!! I guess I better stay away from the caffeine so I can get my sleep.