My dentist wanted me to get one to use as a retainer to stop my bottom middle teeth from sliding or something. I never once fell asleep with it in and after about two weeks of trying (and each night giving up after a few hours) I put it in a drawer and forgot about it. More effective at keeping me awake than caffeine lol
That sounds like the mouth guard I use because I grind my teeth at night but the mouth guards the article is talking about are different. These mouth guards for snoring move your lower jaw forward while a mouth guard for grinding doesn't.