[CPAP] CPAP Data discrepency

[LuthierMike]

I've been a Resmed S9 user for almost 12 years.  Earlier this year, I replaced it with a Resmed 11.  (By the way, it's pretty cool to have a machine that actual recognizes an SD card.)  After a few months, the Dr. wanted a followup call to make sure it was going ok.  They took down my serial number and got a report from Resmed.  It said I'm averaging 9 hours a night.  But I go to bed around 11 and get up around 5 or 6, so there's no way that can be right.  OSCAR data much more closely matches what I imagine my data should look like.

Doctor seemed completely unconcerned that they're getting bad data.  

Is there an explanation?  Does usage mean something else than I would think?  

The machine works.  I'm sleeping great.  I don't need approval from anyone else.  So, it's not a serious problem for me, but it bugs me.

Thanks,
Mike