Oximeters and compound medical problems

I think that some CPAP users might have more than one sleep problem.

If you have an oximeter you can review whether you have oxygen or not and if the plots say you are getting the oxygen and you don't have events, I think the machine is dealing with your apnea problem and maybe you have another sleep problem or another reason you are tired.

Older adults have lower intrinsic factor in their guts and some older adults can develop problems with absorbing B12 and that makes them tired. Others might have other issues which make them tired.

I recommend getting an oximeter so you can see for yourself that your CPAP machine is working and then if you still feel bad move on to see what else is wrong.

I am seeing a doctor tomorrow since I am waking up early all the time. My CPAP machine seems to be working very well. My ex-sleep doctors would be trying to push another overnight sleep study. I suppose it is good for cash flow, but I think three is enough.

Basically get the oximeter, see if your machine is or is not working, eliminate apnea as a source of tiredness and then move on to the next problem.