It's OK Rofle.
Ian, allow me to try to help, now I will grossly oversimplify the situation here, because that's all I know.
Your nervous system has a regulation system to keep the nerve traffic from going too fast, think of them as traffic lights, if your nerve system ran too fast, signals would confused, and you wouldn't be able to operate properly, hence, the traffic lights.
Now, caffeine does not soak directly into your nerves, but it does get into your blood, and from there feed your brain cells and possibly your nerves cells too, after all, all cells need a supply of food, so when you are fed this drug, your nerves take this as a signal from the mayor to turn all traffic lights green, well not all but most of them.
Now your nervous system traffic is rushing around too fast, so stuff starts to get confused, you might feel like you have cat like reflexes but you aren't operating quite right, so that explains any side effects.
Now for coffee addicts who have caffeine in their system all the time, the mayor sees that all these traffic lights have turned green, but the mayor, he isn't too smart and he can't order the traffic lights to turn red again, because they are now under the control of the caffeine, so he orders more traffic lights to be built, so now the caffeine addict keeps drinking coffee in order to feel normal because there are too many traffic lights, and without caffeine, the traffic goes far too slow.
Of course if an addict goes cold turkey, they will feel like crap for a while, because their signals take so stinking long to get down town, but after a while the mayor sees that the traffic lights are working again, and takes down the extra ones, and you return to normal.
Now if this is completely false I aplogise, but this is how it was explained to me one time.
