Earlier quoted context omitted.
If you wake up a lot at night and still feel tired in the morning... have you tried doing a sleep study? I believe that obstructive sleep apnea is severely under-diagnosed.
Yes, I did a real sleep study and they said I do indeed have "mild" sleep apnea but it "isn't bad enough that we are willing to treat it." I do usually need several naps to get through a typical day- and that is after identifying and treating three other major health conditions that can cause fatigue. The newer Oura rings actually have an integrated pulse oximeter and can measure apnea, but mine does not. I wonder if…
Regarding buying your own and learning to program it, I had to do this anyway. My dr was not helpful after I received the machine, and this is true more often than not, which is why so many people don’t take to the treatment.
Look into OSCAR software.