I had one done at a sleep clinc as i'd had a few incidents of what I assumed was sleep apnea.
(if I slept on my back, I'd get the sensations whilst I was asleep that i'd stopped breathing, then I'd jolt out of my sleep kind of gasping for breath)
Like you, I was hoping the study would confirm sleep apnea and that it was my jaws/airway that were the issue so that I could get free jaw surgery!!
However, the study came back with mixed results that the head physician wasn't concerned about as most of my readings were acceptable, so no free surgery on that basis.