Change of sleep

My 5 year old has recently been sleeping differently it started maybe a month ago or less & it's starting to worry me he shoves his face in the pillow & on the mattress & since I'm pregnant I wake up every hour or so to use the rr & have to move him because he's breathing so heavily it's starting to worry me but I'm not sure how I could help it 😕 if I put him to sleep with me he will curl up under me & that doesn't help I'm a pretty heavy sleeper as of being pregnant as well any ideas? To help ? Might take him to the docs for this btw but not sure if that's too dramatic 😬