I totally relate in terms of hyperfocus. I very often get so excited about an idea (like learning neuroscience all of a sudden) that it's hard to sleep.

In addition, I can't go to bed and distract when I have an issue at work or a task I don't know how to solve yet. I physically can't think of anything else until I figure it out. It might sound paradoxical in the context of ADHD but as far as I know it's pretty common :)

Sometimes I think I might be just awfully undisciplined. But it's more tricky than the standard procrastination. And it definitely wouldn't show when I want to watch a TV series or listen to Spotify