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

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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?

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If you close your eyes, can you move your arms so that your fingertips touch each other?

That capability is called “proprioception”, the ability to know where your different bodyparts are in space. Even when you’re a sleep your brain has a fundamental understanding of where you are and where your body parts are.

Young kids, being kind of clumsy in every way, has a much less well developed sense of proprioception. So they do stuff like fall over or fall out of bed when they’re asleep.

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