I have been on CPAP for 3 1/2 months now, with a ResMed S9 Autoset in CPAP mode.  I routinely check the Sleep Report under the Clinical Info menu and record usage, leakage, AHI, AI and Central AI.  The period is set to 1 day, and I check the info within an hour after I wake up in the morning.

This worked fine up until the past 2 nights.  Yesterday morning and this morning, when I check the Clinical Info, it shows 1.0 hours usage, 1.2 leakage, and 1.0 1.0 1.0 for AHI, AI, Central AI.  But the main Sleep Quality screen for last night shows Period  Last night,  Usage  5.9 hours and AHI  2.3 - the usage is correct and the AHI is consistent with my usual value.  I checked the time and it was correct, except that I hadn't changed it to daylight time yet - i.e. the machine didn't think it was the noon day change at 5 am or anything like that.

I can find no setting that would account for what I am seeing.  Can anyone suggest what might be happening?  Or do I just have a machine fault of some kind?  I haven't tried forcing a reboot by unplugging the power and replugging it, but I will do that before bedtime tonight for sure.  That is about the only thing left for me to try, other than returning the machine to the DME vendor.

Bruce