It's exhausting being mentally present while knowing you're not doing anything useful. Using that time to actually work on side projects feels very unethical, so it's kind of just going with the tide for 8 hours a day then being exhausted at night. So the challenges I found were usually in games, not anything productive.

I have far more energy now that I'm actually productively working in a new job and seem to have lost a lot of interest in games as a side effect.