It goes both ways though - if I can't stop thinking about something that's just not quite working yet, then I haven't/can't 'clock out'.

I think I'd like a job with truly flexible hours: work all evening on something if it's occupying my thoughts anyway, but then get a full 'evening' to chill, full night's sleep, and start the next day when I'm ready. I can do the former, but I'm still going to be expected to dial in ~to pointlessly summarise it~ for stand-up in the morning. (No I don't have young children, yes yes this wouldn't work for everybody.)