I know this book gets posted anytime something sleep related comes up... but I still find it underrated.

'Why We Sleep'[0] has changed my sleeping habits for the better and I wish everyone had the chance to read it. It's like a manual explaining how your body works 1/3 of the time you're alive.

[0] https://www.amazon.com/Why-We-Sleep-Unlocking-Dreams/dp/1501...