Is ineffectiveness of caffeine a symptom / indicator of a mental difference? I, too, am not phased in the slightest by caffeine and have had sleep schedules vary, though not as large of a range... just curious
I'm not sure. I have learned in my treatments that stimulants the opposite effect on people with ADHD and calms them down. I don't suffer from that so I couldn't really say.
You could have a genetic insensitivity to caffeine, or your body might be very used to it, but as another commenter mentioned an atypical response to stimulants is common with ADHD.
