My husband of 20 years makes this noise as he sleeps. He INSISTS its not snoring and that I do it too. Whatever. It is snoring, dude and you do it milli-seconds after your head hits the pillow. I can say "Hunny, really? Already" in exasperation and he will go "WhAT??"...Omg, its like a default setting! As soon as he is in the sleeping position it emits from his face!!!
I sleep with my earbuds in all night long (Love my Skull Candy buds). Michael Buble generally sings me to sleep.
Also he does this clicking thing with his nails together. In the movie theater. As we watch TV...if I am driving the car. OMG...dude..your wife has Bionic Hearing for that sort of stuff...but its the family joke that I am deaf to normal socializing noises..its weird (Maybe I need my hearing checked among other things...maybe I have like dog frequency issues?? LOL).
I do things in equal measure to make him bonkers. He is just better equipped to ignore it! LOL