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’m 41 and rolled off my bed in my sleep a few months ago. Landed on my side, arm was sore for a few days. Co-workers had a good laugh when I told them about it.