My husband has sleep apnea and snores. He also holds his breath for large blocks of time and then when he finally starts breathing again, he has a large explosive snort. It's actually very sad, and he's extremely embarrassed about it. But it isn't something he can do anything about. So if he dozes off, it's possible he's going to make loud noises.

Yes, the idea of asking for a seat change has merit. I've gotten so used to it that I can manage... but then again, at home we actually sleep in separate bedrooms it's so bad.

Alas.
Rita