positional therapy pillows, wedges, etc

Very new to this, and would like to know what devices might simply keep me from sleeping on my back, which appears to result in the problem that's been diagnosed. Apparently, or possibly, a deviated septum causes the issue, and though I begin sleep on my side, always seem to awaken on my back. I have the physical sense that my eyelids feel 'heavy' on the bad days....is that at all common? Thank you, in advance

You mention a problem which has been diagnosed. You mention a "possible" deviated septum. What problem has been diagnosed. The septum in most inidividual's noses is not perfectly straight and a deviated septum can affect nose breathing. Not sure what that has to do with having a problem sleeping on your back. Also can't speak to "heavy" eyelids as I am also not sure what that has to do with a deviated septum or sleeping on your back... best to try and explain a little more fully background and what info you are looking for.

Obstructive sleep apnoea happens in your throat, not your nose. If the problem was only in your nose you would open your mouth and it would go away. It is possible to treat OSA with positional therapy, but I've never heard of a commercial device that you can't make just as well yourself for a fraction of the cost. Experiment a bit.

When I was first diagnosed with mild sleep Apnea, my doctor suggested I put a tennis ball against my back inside my t-shirt. I never tried it, but did get a firm body length pillow which helped a bit. Recently I read an article that suggested wearing a large full back pack. That sounds like it could be effective.

As what others have said. The tennis ball idea works, as well as getting a body pillow. I mentioned this in another thread, but my brother got off of CPAP when he had the surgery for his deviated septum. However, I would assume this is not the norm and one cannot expect the same results. My question is, have you actually been diagnosed with sleep apnea, and prescribed CPAP?