FWIW, the book "Why We Sleep" mentions this paper by Francis Crick et. al. and talks about the history of sleep research. I'm in the middle of it because of a

FWIW, the book "Why We Sleep" mentions this paper by Francis Crick et. al. and talks about the history of sleep research. I'm in the middle of it because of a Hacker News recommendation, and let me pass on the recommendation. It's great so far :) https://news.ycombinator.com/item?id=17381235 https://news.ycombinator.com/item?id=17381235 For example, I think most of us now know that napping isn't for the "lazy" but it's nice to see the scientific reasoning for it. The author Walker is a great sleep advocate.