I've experienced the same thing with seemingly impossible problems being totally solvable the next day. Especially with programming. I'll spend 4 hours banging my head against the wall only to solve the problem in 5 minutes the next day.

"Why We Sleep" is poor quality from what I understand. https://guzey.com/books/why-we-sleep/

To be fair, I haven't independently validated this, but Alexey is a smart dude.

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