How caffeine works and some other interesting coffee truths

Coffee, though legal, is still a pretty serious drug.

"Caffeine doesn’t keep you awake by supplying extra energy; rather it fools your body into thinking it isn’t tired. When your brain is tired and wants to slow down, it releases a chemical called adenosine. Adenosine travels to special cells called receptors, where it goes to work counteracting the chemicals that stimulate your brain.
Caffeine mimics adenosine; so it can "plug up" your receptors and prevent adenosine from getting through. Result: Your brain never gets the signal to slow down, and keeps building up stimulants."

No room for tired. Must go on...