I just want to say that, ADHD is misnamed disorder. I have it, and thought for most of my life I couldn't because although I do have trouble with focus when it comes to boring stuff, if I found something interesting it was all I could focus on.
ADHD is just the misregulation of focus, people with ADHD get Hyperfocus (https://en.wikipedia.org/wiki/Hyperfocus) and that sounds exactly like what you are describing.
Thanks for this, looking through the wikipedia page on Adult ADHD hits a little close to home. Having never been someone prone to hyperactivity, or lacking in attention once it's set to something, I never really thought to look into the disorder. The sleep onset insomnia and disorganization seem especially relevant personally.
ADHD is just the misregulation of focus, people with ADHD get Hyperfocus (https://en.wikipedia.org/wiki/Hyperfocus) and that sounds exactly like what you are describing.
If you're remotely, or anyone else, about ADHD Dr. Russel A Barkley's Essential Ideas Everyone Needs to Know is a great watch: https://www.youtube.com/playlist?list=PLzBixSjmbc8eFl6UX5_wW...
And P.S. the guy was correct, what you described above is exactly how I feel when I procrastinate. ;)