[adhesive_wombat]

Very understanding (or even no) partners is probably a large percentage of it! I know there's plenty of projects and learning I haven't done because I have prioritised, across the spectrum of willingness, family needs and wants over "always fiddling with that damned computer". And that's with a partner who generally is pretty understanding, though I still don't think they fully appreciate that 8 hours can just suddenly vanish from my perspective and all I have to show for it is a few red and green lines of text, and sometimes nothing at all except learning.

Also, it can be very difficult to evict an annoying problem from your brain to focus on other things in life. Basically the "his/her diary, motorbike won't start" joke but with something you can't explain without just going for "it's complicated but a chip doesn't work how I expected".