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I think it’s common, but not universal. I sleep on my side hugging a 2nd pillow. That’s the most comfortable for me. When I wake up in a weird position, it’s on my back with arms splayed out like a gunshot victim.
Finally someone else who sleeps hugging a pillow.
I have a pillow both to the left of me and the right so I always have one to grab when I turn over.
It has nothing to do with the lack of childhood affection.