Hey i have a dachshund with a chihuahua mix and it looks the same as the picture

Its 35 years old in dog years and 5 in human years
So this is the problem im worried about
I know this is normal for the dog but it keeps burrowing his nose into a blanked or pillow whenever it goes to rest or sleep
But sometimes it looks like its gonna suffocate its self and im wondering would he back away if that would to happen?
(i do not abuse the dog just for your information)