Do you take any medication? Have you looked up side effects (the kind affecting sleep)?

Your chart looks pretty good, but others with more knowledge of Reras, etc. should be along to comment on those.

There's a time and place for going on and on about how you feel - and most definitely to get sympathy, understanding, etc, but you seem to be determined to feel bad about something lifesaving that the rest of us have decided to tackle, manage and get on with, especially considering you spend more ti...

Sleeping on your back almost always shows up with a lot more hypopneas than side sleeping does.

Whine, whine... grow up already.

You said "for years", but how many please? What are the run hours on it?

And post it here - we'll help interpret and suggest adjustments if necessary.

But even if you have jagged edges, if you take them with water, the edges become negligible.

You may find you get quite a few (more) hypopneas than usual as well though your machine may compensate for them of course.

Can you post new Oscar data? Sounds like your neuro. has a brain!

And that answers the OP's original question how?

Maybe you could look into other reasons for your stiff neck like sports etc. on similar days...

Cervical collars work for those who need them - for when their head drops down and cuts off their airway, probably more often in side sleepers, but not always. If you didn't have that problem, why did you try the collar? And if you did have it, then other adjustments may need to be made with or with...

Sleeping on your back, side, ???

I would want my GP to refer me to another hematologist, not a sleep doctor, as OSA may be blamed for some other not yet diagnosed problem, and the apnea may only be secondary issue.