Also worth checking out his retrospective a couple of years later: https://guzey.com/2022-lessons/#get-minimum-possible-sustainable-amount-of-sleep---get-enough

Also worth checking out his retrospective a couple of years later: https://guzey.com/2022-lessons/#get-minimum-possible-sustainable-amount-of-sleep---get-enough-sleep-to-have-maximum-energy-during-the-day https://guzey.com/2022-lessons/#get-minimum-possible-sustain... I'm not sure whether he's gone back on any of the specific criticisms he made, but his overall attitude towards sleep certainly seems different to before.