N=1, I sleep better on stimulants than off them. No problem falling asleep after drinking coffee (usually it makes me more sleepy), or even taking a prescribed stimulant before going to bed.

There is actual research on this. So n>>1.

Same, coffee is quite sedating.

Some of my best naps have been after taking amphetamines. My brain shuts up, and I can actually relax.

I fall asleep halfway through an energy drink with surprising regularity.

In my youth, I would pound a mountain dew before bed.

Paradoxical effects are not uncommon. My DNA is weird. I have lots of them.

One example, is opiates make me MOVE. Most people they zonk out, not me. I'm ready to move your house, one brick at a time, with my bare hands and feel like I could knock it out in about an hour.

Proton Pump inhibitors are common meds for acid reflux. About 10 years ago, I did a genetics study (I worked at the lab, and my data stayed mine) and learned that of the 7 classes of PPIs available, at that time, my body only works with 1. The others either have little/no effect or similar.

New research doesn't seem to support that stimulants have a paradoxical affect on those with ADHD (the sources cited were pretty interesting in my opinion). I'm not saying it's not possible for some, but it seems like people make it out to be far more common that perhaps it truly is.

https://en.wikipedia.org/wiki/Paradoxical_reaction

In my specific case, it's a simple fact.

It may not be everyone's issue, but cases like mine do exist. It's not better or worse, it's just how it is.

Coffee makes me hyper, and I have ADHD. My diagnosis was quite rigorous too, and not just some questionnaire(s).