I’ve dated one person who could not bear to be touched at all in her sleep (but she insisted on sharing the same bed, which made things awkward for me) and another person who snored, but I think that humans probably generally sleep better together. It isn’t a sexual thing - look at non-human animals and how they often sleep cuddled up together. As a kid, I shared a bed with my grandfather (we lived in a small apartment) and I would fall asleep hugging him, and as an adult I slept better when I could cuddle up with my dog.