5.0

read this book and you'll never have a bad conscience for napping and sleeping long. Sleep is anything but unproductivity. Very insightful - society should definitely reconsider it's relationship to sleep.

as I read the author has been criticized, here is a blog post where he deals with the criticism https://sleepdiplomat.wordpress.com/2019/12/19/why-we-sleep-responses-to-questions-from-readers/