Jeff, try sleeping on your stomach if you can.
Can't....and how I wish I could.
My nose is a largely useless protuberance which is supposed to take in air but if I try sleeping on my stomach it closes up.
I don't have sleep apnea, I have nose apnea, the result of injuries sustained from a car accident at age seven, an eight year love affair with the Bolivian marching powder (said affair ended twenty-six years ago) and just a few instances of being in the wrong place at the wrong time and running my yapper instead of walking away.
If I could force my nose to stay open, sleeping on my stomach would be my default anyway, because it just feels better to me.