I will say, as a ADHD haver. Caffeine just hits some people differently. I can drink coffee have my medication and still sleep. My wife drinks black tea before bed and is up all night.
There is also something to be said about being ND and having various disabilities like autoimmune issues. In some cases caffine can reduce pain. I don't think there is a lot of research on this yet, but from personal experience and the few things I have come across something is there.
Aka to all the above. Self medication is a hell of a thing.