Just one caution:
Not everyone can be successful sleeping on their back. For some their apnea will just not permit it. But it is certainly well worth the effort to see if you can do it. One of my biggest joys with the cpap experience has been sleeping on my back -- something I had not been able to do for many years.
For best results, try to make sure the head of your bed is elevated a bit. Not just extra pillows, because usually that will just force your head to bend forward, making your breathing more difficult. But if you elevate your upper body so that in theory you could actually see your toes when laying on your back, then you will have the best chance at succeeding. .....and one additional caution: if you elevate your body too much you might end up on the floor in the middle of the night on top of the kitty.
I know exactly how you feel. I, also want to sleep on my back. I have an arthritic shoulder, 1/3 of my neck is fused together so it does not move like it should, I get muscle pain in my neck and up until recently I had severe sciatica. I JUST WANT TO SLEEP ON MY BACK!
I have tried it all. Raising pressure, sleeping upright or inclined, it does not help for me. I have positional apnea and my AHI will go up to 20. I sleep by switching from one side to the other as the discomfort gets worst. I still sleep better then before I was treated for apnea.
BUT, EVERY ONE IS DIFFERENT! You might have success with trying some of the ideas.
I had to start sleeping on my back but I prop myself up with pillows. Not due to apnea reasons but for comfort. I took my body pillow and made a U out of it, with the "legs" pointing down the bed. I put my head at the top of the U and the legs then support my shoulders. I use two pillows under my legs and thighs for further support.
My suggestion is to leave the pressure alone. You want to see if you need to, first. You may not. If you increase it, then you have to adjust to it (do you have pressure-induced central events?) while also adjusting to sleeping on your back and adjusting to the pain that is causing you to sleep on your back. Too many variables. Sleep on your back for a while. Gather data. Rest. If the AHI consistently jumps to over 5 and stays there over 3 nights or so and you don't ever do that and you don't feel rested, then sure, increase it, say, half or a full point. If it increases above your normal but stays below 5 and you are feeling rested, leave it.
Who knows, you may only need to sleep that way a few nights and then you can go back to sleeping your regular way. Then you'd have to drop the pressure back down.
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