I've been told by medical professionals that the best position for a person to sleep is on our backs. This might be best for your posture and to prevent sore muscles, but it doesn't make much survival sense.
Can you imagine a wild animal sleeping on their backs as we are supposed to, with belly exposed, throat exposed, genitals exposed, completely vulnerable?
Millions of years of survival education means that animals have learned to sleep with their vulnerable tidbits protected - sleep means being curled up, usually a combination of sleeping on the side and the tummy. Shouldn't humans sleep the same way?
Take a look at this article by Michael Tetly, Physiotherapist. It's interesting reading (with more than a couple unintentional LOL's) and quirky photos.
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