A "stop snoring" device that works?

I have a major problem falling and staying asleep at night. I literally will lie there for hours on end, staring at the ceiling, checking the time periodically… sometimes it takes up to 5 hours for me to actually fall asleep, even after taking sleeping pills.

My partner snores, which definitely makes the problem much worse. When she isn’t home, I usually fall asleep within 30 minutes-1 hour.

BreatheRight strips didn’t work.

I saw an advertisement on TV a few times about some device that you put in your mouth at night that opens your airways and stops the snoring, but I’m not sure what it’s called or if it works.

Does anyone know the name of this product, or ANY stop-snoring products that work?

(If it’s any help to know, my partner is overweight but not like morbidly obese or anything, and she snores no matter what position she is in)