Caffeine doesn’t “give you energy” in the way that most people believe. All day everyday while you’re awake, neurons in your brain are firing and producing a neurotransmitter by-product known as adenosine. Please understand, adenosine is more than a simple waste product. Your nervous system is constantly monitoring for adenosine in your body, because once the levels of it rise to a certain point in your brain and spinal cord, your body starts to nudge you to go to sleep (or at least to relax). Then, in comes the caffeine . .
