I've heard people say that cry it out only works because babies then learn that no one will come so there is no point in crying, but surely that's nonsense? Surely babies don't wake up in the middle of night and sadly think to themselves "oh I may as well go back to sleep as no one bothered to come last time".
I'm curious as to why it does work tbh as it goes against all my mothering instincts yet I am jealous of people who's children sleep through the night and don't seem to be feeling any ill effects of being left to cry it out.