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I use a nasal pillow, but you might try a pillow or a mask. AND to keep his tongue inside his mouth, you might try a CHIN STRAP. My uncle wears one. It wraps about the head and chin to hold the mouth closed. Of course, if he CAN'T breathe though is nose, that could be a problem The chin strap is good to use if you have a nasal pillow with c-pap. A professional should be able to review his condition and make recommendations. He may need a sleep study.
Besides keeping his head elevated when he sleeps, he might be eligible for nighttime oxygen or a C-PAP.
PamZimmrrt is I believe a respiratory specialist. She probably has some good on point medical advice if she sees this post and responds.