Personally, I find how I spend my time outside of work has a big impact on how motivated and productive I am at work, regardless of how meaningful my work tasks are. Obviously basic things like sleep, diet, exercise are important, but I have also found that spending too much time on things like video games, streaming shows/movies or social media really leaves me feeling depleted and unfocused during work hours. The more I avoid screens outside of work hours, the more productive I am during work hours when I have to look at a screen.