Tolereance is one thing, but sensitivity is another factor to consider, I think. Tollerence is a pure function of the frequency you put a substance in your body. I'm sure my caffeine tolerance is off the charts, as I drink 4-6 cups of coffee (no sugar, sometimes cream if its crap coffee) a day. But my sensitivity is also very low. My whole life, even before coffee as a kid drinking soda, I have never felt stimulated from caffeine. I sometimes wonder if I'm immune, haha. I could literally drink a cup before bed and be fine. So why drink it you ask? Because I think it's delicious, and I belive there to be myriad other health benefits to coffee.
This might sound insensitive but it's possible you're not aware of the effect. For a while I also thought I was not stimulated by caffeine, but I realized I just didn't know how to recognize the effect.
Edit: I would add that being high on caffeine doesn't necessarily mean I have trouble falling asleep.
Yeah it's possible, but I'm sure it is having some type of an effect. I don't doubt stuff is happening at the cellular/ chemical level. It is just so difficult for me to even perceive. It could be changing my conciousness more dramatically than I realize, but as far as the purely physical effects many people report (becoming jittery/ restless, trouble sleeping) they are just not there for me.
Do you not feel "more awake" with the ability to focus better, etc.? I find that as long as I'm focused on a task the effects of caffeine are negligible; it helps me stay focused. As soon as I go interacting with people, the effects become really visible and a hindrance. My mind is a bit too fast and fragmented for these slow and broad interactions.
I don't know by which method to begin to recognize it. In myself I started to notice slightly more fragmented thought patterns; proneness to having more new thoughts interrupting the current line for thought.
I wonder if there is some bloodwork or something that could prove/ disprove this hypothesis, haha. I don't care about the stimulation, I think coffee is legit healthy for you(as long as you don't add sugar). There is some evidence coming out suggesting the complex blend of chemicals in coffee might hold many beneficial compounds.
