I recently went through this process for a first class medical. I was shocked I had it, as I'm in good shape, active, eat well, am healthy, etc. I had the idea (as most do) that it's an issue the obese deal with. Well, it's true it can increase the likelihood of apnea, but they now think weight gain is a symptom of apnea, and not the cause. So maybe I caught it before the weight gain?
In any case, the FAA wants to see that the machine is working for you. They want to see the printout from the data card in the machine that shows you use it consistently for at least 6 hours a night..maybe 4, I don't remember. But you also have to show that it's bringing your AHI to 5 or lower. The AHI is the number of apnea events per hour. Well, it took me a few weeks to get used to the mask. I hated it. I hated the air pressure. Made me feel like I was choking. So for the first few weeks, my AHI hovered around 10. Too high. I was discouraged and thought this would mean no more medical for me! Well, suddenly, something clicked and I got used to it, slept soundly, and my AHI dropped and stayed around .2 per hour. Fantastic.
Once I had a bout a months worth of good quality sleep with low AHI on the data, I had to see the doc and give him an update on daytime sleepiniess ( they have to see that you don't have it anymore), quality of sleep, energy levels, any memory issues, etc. Everything improved quickly and dramatically for me. Doc wrote a note, we submitted the data printout, and I got the special issuance. It took about 4 months to hear back though. Long wait. Like the others, no MWT was needed.
The biggest pain was the wait, getting used to the machine and giving it the time needed to work and for me to get used to it, and also having to go to the medical equipment company to get the printout. The docs office couldnt do it. ANd I cant see the data on screen. IT only shows the previous night. So I"d have to run in, get a week printed, saw it sucked, wait a week, do drive all the way out there again, another bad week, etc, until I saw the good numbers. Time consuming.
I'll have to provide such a printout every 12 months for the rest of my life, along with updated physicians notes, at each medical.
PS - I suspect A LOT of pilots have apnea and are scared of being tested. I have heard pilots snoring in the room next to me to the point it kept me up. Or they yawn all the time, no matter how long the overnight. Complain of being tired all the time, etc etc. Yeah buddy, go take the sleep study; your health is not to be toyed with.
The biggest problem with apnea is it is torturous on your cardiovascular system. It's not worth screwing around with, and can have serious negative health consequences if ignored. I think you're going to see more and more pilots, even at the airlines, dragging their machines around.