Awesome tool - - after several nights of awful insomnia (1 or 2 hours of sleep), I think I see a potential explaination for the problem. I'm gonna cut back. Way back.
Thanks very much for posting!

Hi All - I am under the care of one of the physicians who wrote those papers about using dead space to improce CO2 control, etc. to improve control of central apneas. Regarding the controversy around non-vended masks, the solution that my physician recommends, is to find a vented mask which you find...