You can try a few mouth guards that can be purchased off of Amazon which may work to varying degrees based on the cause of your sleep apnea. From my experience

You can try a few mouth guards that can be purchased off of Amazon which may work to varying degrees based on the cause of your sleep apnea. From my experience this[0] model had the best results. These type of mouth guards tend to work if you have collapse in the area behind your tongue, which may or may not be the case (more likely if you are overweight). An Alaxostent is another option if you're experiencing soft-palate collapse; however, it's expensive and hard to know if it will help before the fact. It's possible that you're experiencing collapse in both areas; and it's also possible that neither device will work, depending on the severity of your sleep apnea; namely if you're overweight. I had "mild" sleep apnea that left me VERY fatigued because it was characterized by mild hypopneas (slight secessions in breathing) at an incredible frequency which stopped me from reaching REM throughout the night. The devices helped. To ameliorate the situation completely I found a great doctor out of USC who ended up performing 4 procedures and 3 surgeries. I had my uvula cut, my tongue burned, my palate ablated, and a few other things. It was an incredible headache during the time but well worth it and now don't need a CPAP. Also worth mentioning that I had some gut dysbiosis at the time which can masquerade as sleep apnea. Good luck to you. [0] https://www.amazon.com/Eliminator-Sleep-Custom-Bruxism-Mouthpiece/dp/B0756P7MJ7/ref=sr_1_71?dchild=1&keywords=sleep+mouthguard&qid=1593314902&sr=8-71#customerReviews https://www.amazon.com/Eliminator-Sleep-Custom-Bruxism-Mouth...