Why does sleeping on my left side feel more natural?

I always sleep on my left side because it feels more natural to me. How did my body arrive at this “decision”? Might it be anything to do with being right-handed? I gather we drive on the left because gentlemen used to ride their horses on the left because this allowed them to have their favoured right arm holding their sword. Might something similar be happening to my body? Do right-handed people tend to sleep on their left side and left-handed people sleep on their right?

Peter Hanson, Whitestone, Exeter

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