It could just be you are truly getting the treatment you need and are just playing catch up with your sleep. You need to give it some time. I've also made the switch from pillows to FFM (then back again). Make sure you have the FFM that fits you right. There are a lot out there. I have no idea what the 0-4 means on the A10s. Is that what the screen says or are you using software?
Either way, give it time. More than just a few nights. As long as the leaks stay low and the AHI is low, it could just be your body is enjoying sleeping too much and wants to stay there!
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I agree with Paula, leave it a couple of months
Welcome to the board theroafam!
I think just relax and stay the course for a week or so, then take a look at the data. The most important part is to keep with it. There are so man things to get used to on therapy, so give yourself time. It's not a race and anything under 5 is great. You may find your AHI numbers drop as you get used to everything. Many of us felt tired after starting therapy, as our bodies go "Yeah! I like this. MORE!"
Many people need a little more pressure with a FFM. The FFM can push your jaw back and make your airway a little smaller.
Get the free SleepyHead software here
for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
I agree with the others as to leave alone for a little while and see how you do.
The only thing I see that you might watch for is make sure your mask is not on too tight. A very low leak rate can be a sign of too tight, which could cause stress.
I'm going to go with the leave it alone for a bit school of thought as well. When I was going through my mask search process, I noticed that my AHI's varied depending on the type of mask with FFM being the highest. Best of luck on the journey.
I am FFM and often AHI under 5, rarely under 3. There is a bit more volume to fill with air, so the designed leak rate is higher and the reaction time of the machine to inhales and exhales has a greater lag time. That can be interesting if you have EPR or pressure relief settings high.
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