Useta sleep on my front, with head turned to the side. Now I am old, and I sleep on my back, propped up a bit, which keeps my asthma from giving me pneumonia, honest to God, don't ask. Plus I elevate my feet. It's actually very cozy, kind of like being in a hammock but with no worries about tipping out. And the cats have no problem finding places to snuggle next to me. 
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"I believe you find life such a problem because you think there are the good people and the bad people," said the man. "You're wrong, of course. There are, always and only, the bad people, but some of them are on opposite sides."
-- Terry Pratchett, Guards! Guards!