You reminded me of a post I had read on a math-related website. I think it was a math association where different authors could post articles, but it was one about a series of advice columns by people pursuing PhDs or graduate studies in math.

Anyway, the article I'm thinking of was about a guy who had advice along the lines of "keeping up your hygiene" or "maintaining your cleanliness habits" and his anecdote was about being stuck for a while in making progress on a problem, but he would have a habit of taking a daily shower. There was a detail he shared about getting an insight and then being able to write some ideas on the window with the condensation.

I wonder if I can find it again.