This is definitely a phenomenon for me. I remember reading in A study that feet warming up was the factor best correlates to falling asleep (I remember it from

This is definitely a phenomenon for me. I remember reading in A study that feet warming up was the factor best correlates to falling asleep (I remember it from only a few years ago, maybe it was a follow-up to this 1999 study? [1]) [1] https://www.nature.com/articles/43366 https://www.nature.com/articles/43366