My dog likes to bloke his nose and breathe through his mouth?

So my dog likes to do this sometimes, mostly at night and I've always been curious as to why or if anyone else's doggo does the same?

He was born deaf if that has anything to do with it as he's the only dog out of my others to do this and the rest were born with hearing.

He likes to shove his nose right into a rug or his dog bed and tries to breath through his mouth? It's always been so strange to see as it's not like normal panting. When he does it, it sounds like he is always trying to breathe more air in and then like forces it out his mouth because his nose is shoved right into a rug blocking his nostrils?

i'm interested to see if anyone else's doggo does this!