Caffeine on brain power

Drinking coffee has been part of my routine. I often found myself become very dependent on the power of caffeine to energize my brain and keep it going even after lunch. It has become my fuel, and I can't run my biological systems without first drinking coffee.

I was just thinking about how caffeine fires up mental alertness when I came across this article:

http://www.psych.umn.edu/courses/spring05/dionisiod/psy3061/caffeine.htm