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

Hurts more as you get older so you learn to do it less 😀 …I dunno, I fall out maybe once a decade.

Seen a dog fall of the bed a couple times and they have the most bewildered expressions when they do — total incomprehension what just happened.