Stop breathing

Loud breathers - can they not hear themselves breathing, and if so, why don't they breathe more quietly? I'm not talking about people who just ran up the stairs and are out of breath. I'm talking about the old man sitting too close to me in the quiet room of this library, breathing so loud through his nose that he might as well be snoring. He's just one of many loud breathers I've noticed lately. I might have to spend the next two weeks with earplugs permanently stuck in my ears. Please people - control your bodily noises before I snap!

Really - this isn't too much to ask, is it?