Why does sleeping on my left side feel more natural?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
  
  

Peaceful Woman Asleep In Bed As Day Break Through Curtains
Why is one side better than the other? Photograph (posed by model): monkeybusinessimages/Getty Images Photograph: monkeybusinessimages/Getty Images/iStockphoto

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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