This was roughly my experience.Expect to be ready to go to sleep at 9 PM. They'll be done with you at 5 AM. I was not prepared for this - I'm a night owl.
You'll get a lot of wires attached to monitor respiration, pulse, brainwaves etc.
You start out without the CPAP to get a baseline.
After they wake you up in the middle of the night and attach you to the CPAP expect the best sleep you've had in years. I was really disappointed I couldn't take the CPAP home with me, it made a huge difference. I use the mask that covers the nose and mouth and had no problems adapting to it.
The cpap mask they gave me was just a tube with a piece that shoots air up my nose, worked pretty well. I remember waking up once with it on, I think they were messing with levels or something, I was getting entirely too much air shoved through my nose. Other than that, it wasn’t bad.
my experience was pretty pleasant overall, if you go to the mercy sleep study place off memorial in OKC the rooms are like a modest hotel room. They give you a fancy sleep number bed. There was a white noise machine next to the bed, which was nice. Bring whatever PJ’s and pillow you like. I sleep in just my boxers, they let me do just that with my own pillow from home too. I went to the bathroom before we got me hooked up, brought myself a bottle of water and a pedialyte for next to the bed, and settled in.
I really look forward to getting my machine, but the VA told me there’s a pretty big nationwide back order on them. So it’s gonna be a while.