Same story here, just with modafinil. All the signs were there since as far back as I was 7 years old.

I've been able to control my focus so much better which seems to make me less tired. When I sit to get work done and inevitably get distracted, I can recover instead of go down a spiral of unproductiveness. I'm also better at prioritizing my focus on the things that are important, such as a must-have feature for launch, rather than a nice-to-have that I just enjoy working on more.

And surprisingly, I've been getting some of the best sleep of my life so far on a pill designed to keep you awake. Who knew?