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I found this study a while ago and I think it's pretty interesting to see how most modern sleeping and resting positions are so different than the natural sleeping/resting positions adopted by those without mattresses and chairs. Apparently, those that use natural positions suffer from less back problems, although the evidence is only anecdotal.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1119282/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1119282/