While awake, the throat muscles hold the airway open, and air passes through silently.
Asleep, those muscles go loose, even more on the back, after a drink or with a blocked nose. The tongue drops back, the airway narrows, and the throat starts to vibrate. That vibration is the "freight train" that shakes the mattress.
Earplugs muffle the sound, not the shaking. That is why so many nights still end on the couch.
Orvell sits under the chin, right over those muscles. When the snoring starts, it gives a little buzz that nudges the muscles to tighten and the airway to ease open. When the snoring stops, it goes quiet.
Nothing in the mouth. Nothing on the face.
No sticky pads. Nothing to buy again.
Only acts when the snoring starts.