I recall reading that people who have ASD and other neuroatypical stuff are more likely to be trans than those who have not. In practice it's obviously not that simple, but I find this theory interesting.
FWIW, I have ADHD and I think with autistic traits. When I was a kid it was actually suspected that I have an ASD, but it was never diagnosed and to be honest I don't think I would meet the diagnostic criteria today. Then again I'm not sure if I've "grown out" of those traits for real or if it's just the effect of the meds I'm taking. Before I was put on them I was very compulsive, prone to addictive behavior, lacking empathy and practically face-blind. Also way less social, but it's hard to say whether that's because of the meds or because I'm generally happier and feeling good about myself these days.
I don't take meds on holidays or weekends, unless I need to behave myself or get something done, but I think while being on them I've learned a bunch of new coping skills, so to speak. For instance I act much much less compulsively now even in my off days, although I've noticed that if I experience a lot of stress I'll fall back on that kind of behavior regardless of medication. In a way it's a blessing, as that way I will know in an instant that I need a break before it escalates into a burnout or something...
EDIT: And I just noticed this was in MTF forum

I do have ADHD alright, can't afford to pay attention to detail if my life depended on it