@TiredBill, do you have any theories about why you have central apneas? I'll be interested to hear your experiences with the ASV machine. My last lab sleep test was about 5 years ago. I had to leave early because I had literally no sleep while hooked up. The place was very comfortable, and the technician was excellent, but being tethered to all those electrodes and having to be so careful about moving with them on just torpedoes my sleep. Can't they just pass you through a pod instead of having to be covered head to toe with electrodes? Maybe I could tolerate it better now. I've never had much data from a sleep study, but a previous one showed a few central apneas in addition to the hypopneas. My sleep doctor said a few CAs aren't unusual or anything to worry about, but I would make sure they haven't increased. My apnea is mild and seems to be pretty well controlled with a dental device. I've had some of the home tests to verify this. The home test that just measures O2 levels and obstructive apnea is very uncomfortable for me, too. Those wrist monitors always hurt. I have tiny wrists, and the monitors are always such big honkers. My sleep is always poor when I do these home tests. I do have an autopap and would like to see if sleeping with a mask gets me better sleep than the dental device. However, I've had problems with recurrent sinus infections, so haven't used one through the night. My ENT thinks even with the stuffiness and congestion from the infections that I might still tolerate the machine. She thinks I would really benefit from the moisture since part of my problem is that my sinuses dry out so much that I have to use nose spray about every 30 minutes during the day. You guys have inspired me, so I'll try it again.