After few weeks of dithering, I finally undertook my titration study one month ago, and the follow-up appointment. I was recommended a BiPap, but all apneas were central and were told I did not tolerate ASV. Intrigued, I discussed and asked questions about this with my doctor. I knew I hadn’t slept well due to a head-splitting migraine; I might have slept for maybe 4-5 hours and was worried about my worst central apneic episodes not showing up in the study. I was noted to have a sleep efficiency of around 69%, (I thought it might be less). Anyways looking at my detailed report, I was assured that my worst central apneic episodes showed up almost immediately. I was informed that I have something known as Biot's breathing. Having no idea of what it meant, I was just looking at report wanting to see why I was tested on Bi-PAP mode. It turns out the tech tested me on ASV (Adaptive Servo Ventilation) for only 45 minutes as he felt it was disturbing my sleep and shifted back to Bi-PAP mode, instead of trying other settings. I told my doctor that I knew BiPAP would not help in resolving central apnea and I am in no mood to undergo the test again. Even he was wondering why was Bi-PAP setting used and checked with his other colleague and came back saying ASV would do fine and in case I am not comfortable, he would run it closer to the Bi-PAP setting. Cutting a long story short, my central question is what is Biot's breathing and whether ASV would be suitable for the same. Moreover, I do not have the copy of the detailed report yet since they said they would give me the report after including the new recommendations. Also, do I need ASV (certainly an afterthought) or can I handle my Biot's on Bi-PAP? Another doubt that I have is regarding nasal pillows. I was told nasal pillow would be a problem with ASV. I am unable to use FFM since I have severe pain using that and I was switched from FFM to nasal pillow mask. Eagerly waiting for recommendations.