So, I have been thinking about this because my wife has woken up in the middle of the night thinking I was falling off the side of the bed whereas my sleeping body knew perfectly where the edge of the bed was.
Also, sleeping kids sometimes roll over and fall off the edges whereas as we grow up, our bodies somehow come to learn this ability.
And, it works for us even if it’s an unknown bed for us (a hotel bed for example).
In: Biology
We evolved to not fall out of elevated nests in trees. The edge of a bed is pretty similar.
Your brain has a sense that relates to your body and it’s location(s). A vector based “image” that is part of your subconscious mind. It works whether you’re awake or not.
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