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

In addition to all of the wonderful responses, I would like to add that… you still CAN fall off the bed as an adult, it’s just not as common because of all of the reasons outlined.

I may have… anecdotal evidence for this.