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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In addition to not falling off, people are surprisingly good at not shifting on top of a baby-sized thing in their sleep. This is one of the things that is very self-reinforcing in evolutionary terms: the people who can’t stop themselves rolling on top of a baby or into danger are less likely to leave surviving offspring.
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