I see CPAP rightly getting mentioned a lot here. What worked for me was a MJS (Mandible Jaw Splint), it’s basically a mouthguard you sleep with that moves your lower jaw forward and thus brings your tongue forward so it doesn’t obstruct your airways.

Best bet is to get this custom made. Here in Australia there are specialist dentists that do this for you. It’s far easier than CPAP and works just as well for many like myself.

Often folks will use CPAP at home and these mouth guards when travelling.