I've been performing a little experiment on my self lately. I would routinely drink 1-2 cups a day, so I decided to give it up to see what would happen. Even after two weeks of letting my body forget about the addiction, I feel much more unmotivated and tired. Then I started thinking about how caffeine works. It not only blocks out certain chemicals (adenosine) in the brain that signal sleepiness, it actually stimulates the adenosine detectors in the process. So I've reasoned that even if my body becomes immune to the stimulation effects of caffeine, it will still help block the adenosine that would have normally been detected without it. Does this reasoning sound logical? They say that given a long enough use, you will need caffeine just to feel "normal". Is that entirely accurate given your experiences with drug?