[thn-gap]

I feel this also represents my situation quite well. Here's personal experience:

What worked the best for me to deal with a full-time job and a side project of gamedev (or programming in general) was to move the side project development time in the morning before my full time job, and just put a bit less effort into work overall (remote work helped here as well). Moreover, while I tried to have a consistent routine for my personal dev time, I tried not to force it when I was really not feeling like it, to avoid burnout.

I sometimes did additional gamedev in some evening (or moved the morning one), but otherwise, tried to do non-computer stuff in the afternoons/evenings.

Another key insight, is that this also helped me getting an earlier sleeping schedule. Previously I would procrastinate until late, even if tired, because whenever I went to sleep, I would then wake up and have go to work immediately. Instead, now I rather go to sleep early, because I know I'll have more energy to do the things I like in the morning, rather than full-time work.