Humans are evolutionarily meant to spend approximately one-third of their lives sleeping, and this function is vital.

“Sleep has fought its way through heroically, you know, every step along the evolutionary path.”

“does it strike you as odd that evolution would have designed us to spend a third of our life not mating not watching out for predators not hunting for food but doing this thing for some other purpose do you think that thing must have been important”

“evolution went to great lengths to do this and superficially at great cost to us right i mean you could argue well imagine you didn't need to sleep and you could spend 24 hours a day foraging for food or a mate or some other thing but it didn't so it's sort of it's sort of like there's probably a reason we are not anaerobic to your point about reducing oxygen saturation by 25 you know if you were to think about that you know during sleep just as you said you're not eating you're not finding food you're not finding a mate you're not reproducing you're not caring for your young you're vulnerable to predation on any one of those grounds but especially all of them put together as a collective completely anti-evolutionary it sounds like the dumbest thing”