I'm not sure if this exactly what you're talking about, but I think it's important to be able to be content and calm while doing nothing. If not, it's a sign something is off with your mental health.
In very general terms, our brains are pretty good at finding ways to avoid lingering mental issues (trauma, anxiety, etc). You're probably familiar with strategies like alcohol and drugs, but people also use strategies like exercise, work, keeping busy, etc. The goal is the same: keep those pesky thoughts down and avoid them. If you're not doing something, these things bubble up and cause issues.
Are you mining dopamine to carry you through uninteresting tasks? Dopamining is an ADHD cornerstone. Have you had the same special interests for a long time? Do you have a collection of interests on rotation? Cheers, M
This should fill the gap and possibly improve your thinking power. https://www.dogpile.com/serp?q=games+for+brain+health&sc=nZA...
No, I’m capable of doing nothing. It’s not hard. It’s actually easier than doing something.
That's called being bored
I discovered this term monotropism and now I can't stop thinking about it (only partly joking): https://en.wikipedia.org/wiki/Monotropism. Not saying it necessarily applies to your situation but I hope you can see why I make the connection.
> Monotropism is an individual's tendency to focus their attention on a small or singular number of interests at any time, with them neglecting or not perceiving lesser interests.
I recently also picked up Magic: The Gathering again and started playing at a local shop. Now I can't stop thinking about decks which might be fun to brew. I guess I'll see how long it lasts but I intend for it to be a long-term interest.