Eli5 why grown ups do not fall down from the bed?

Question

I am wondering why small kids ( even a few years old) fall down from the bed while changing their position but bigger children /adults do not, no matter how much they move while sleeping?

In: 2276

Answer 1

I have fallen out of bed more times as an adult than I can count, although not often at home, from my own bed. It mostly happens when on vacations. The most comical incident was when I became wedged between a bed and the wall, had to yell for help, and the worst was when I hit the side of my head on a marble topped nightstand, which required a trip to the emergency room.