(07-23-2013, 05:39 PM)oak Wrote: Does this mean that if you lie awake for an hour trying to get to sleep with the mask on, that it will skew your data?
Strictly speaking, yes. This is where using software to look at the detailed data for the entire session is helpful. You can discount the parts of the data that you know you were awake and just look at how things went during the time when you were asleep.
Don't worry too much about it though. Let's run through some sample numbers so you can see the effect. Let's say you were using CPAP for a total of 7 hours and got an overall AHI of 5. That means there were a total of 7x5=35 events during the session. Now, assume all of those events only happened while you were asleep, and you slept for only 6 hours (ie. you were lying awake for 1 hour). That means your "true" AHI is actually 35 events in 6 hours, or an AHI of 35/6 = 5.8. So there's not a huge difference here.