Airsense 11 not recording full night sleep duration

[CanadianCat]

Hello all, I am new to Cpap and purchased an AirSense 11. I am having decent success with it, but I find it is not recording my full night's sleep. For example, last night I went to sleep at 10pm and woke up at 6am.. a full 8 hours sleep. My machine was on and the seal was perfect when I woke up. However, when I checked the MyAir app to see my score, it said the sleep duration was 4.4 hours, and when I checked the machine itself, the screen only measured 2.6 hours. I don't understand why it isn't counting the full night? I can't find any info on this anywhere.
Cat

[Crimson Nape]

Hi CanadianCat!  -  
The AS11 has a timezone setting.  Yours may be set to the incorrect one.  If you are in the Central timezone, then it should be set to GMT-5.  A Resmed's day is from noon to noon the next day.

[CanadianCat]

I've just checked. It is set to the correct timezone (Central US). I just don't understand why it only thinks it was on for 4 hours, when it was over 8, without any removal.  I am ordering an SD card to put in.
Cat

[ScottZZZ]

One possibility -- Check the machine settings under "My Options" and make sure the "SmartStop" feature is disabled.  

That feature can misinterpret temporary leaks as a "mask removal" and stop therapy.  Assuming SmartStart is ON, therapy will start again sometime later.  That cycle can keep happening all night long, greatly reducing the total time in therapy.

[CanadianCat]

Thank you so much for your assistance! I discovered that it was indeed the noon-noon time capturing, as all the previous use showed up after the machine updated today.
Catherine