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

There is a fallacy in your premise. Many adults do roll out of bed, and not all children do. Two examples of the first from my life:

We moved our bed so I could sleep against a wall after I rolled out of bed into the nightstand. I was over age 30.

Also, as a teenager I once somersaulted out of bed in my sleep. I hit a dresser past the foot of the bed hard enough to leave large bruises but still didn’t wake up.