Do you have ADHD (or think you might have?)

If so the difference when you are not drinking coffee might be more disorganisation/inattentiveness/impulsivity etc. rather than being less stimulated.

I have learned that I can have four Aeropress brews per day (about 12.5g coffee per cup) and it makes me calmer, more focussed and more able to be organised. I would notice discomfort and jitters at maybe six in a day. But I can fall asleep an hour after drinking one; it has little effect on my sleep and it may even make it a little easier for me to initially fall asleep.

And then I can have nothing the next day and be fine; I only notice withdrawal on day three maybe.

The reason is, it seems, I have otherwise very unmanaged "inattentive" ADHD. (Which is a stupid name for it; I don't have the slightest problem paying attention to things that capture my interest)

Actually I never felt the need to be diagnosed with ADHD. So I just looked up online and at first-read I don’t think I have something particularly different that could classify me but I might be wrong. Pushing it I also read that there is genetic part to cafein sensitivity but my parents don’t drink coffee at all so I guess I’ll never know. It’s not really a problem though, I can drink double espresso and take a nap or go to sleep which is nice. I can enjoy very good specialty coffee without trouble