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[CPAP] Most nights periods of hight AHI
Looking at the graphs I find that most nights I get a period of high AHI.
I mainly sleep all night on my back as I get sore shoulders on my side.
Can anyone suggest how I can get the AHI down in these periods?

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The bunch that you have at about 430 looks like it may me SWJ or Sleep, Wake, Junk, ignore it, very common. Otherwise you are looking pretty good. I counted 15 events over 6 hours or about a 2.5 AHI.

Since you are running with a fixed CPAP pressure of 13 cmH2O we will not see a pressure response like we would if you were in Auto mode, but the general rule is to raise pressure to reduce H and OA events.

Again that cluster of events when you were falling asleep needs to be ignored.
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There are bed toppers which may accommodate you hips better. A supportive wedge pillow (ex Therapedic reading wedge) at your back can help too - the edge can be positioned partially underneath your torso to help cushion it.
Please organize your SleeyHead screenshots like this.
I'm an epidemiologist, not a medical provider. 
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Bruce, why are you using CPAP mode rather than auto? I see parts of the night where you would benefit from more pressure, and others where less might be better. I think you'd do better on APAP at 11-15 pressure.
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I started of with a machine on full auto for 2 weeks and it slowly went down from AHI 26  down to the best night of 5.20.
The next 2 weeks I went on to manual and immediately my AHI was below 5 except for a very restless night that was 6.
One night my AHI was down to 0.9.  I tried auto between 10 and 13 but was not as successful as the fixed pressure.
I would like a lower pressure as my mouth does not get dry at 10.
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