Research from Johns Hopkins Medical school shows that what people sense an increase of performance when taking caffeine is actually from the new caffeine taking you out of the caffeine withdrawal and back to normal.  Click here to read on the

1. The Good: Isn’t Really Good (caffeine doesn’t increase performance, it just takes it back to normal for short period)
2. The Bad: Adrenaline (the energy is that it released adrenaline, making emotional overrun behavior. Also, it raises blood pressure, stimulates heart, and give you rapid shallow breathing [depriving brain of needed oxygen]
3. The Ugly: Sleep (takes 24 hours to clear your system, thus when you wake up your body hasn’t recuperated and thus the “need” of caffeine… a vicious cycle)