What is the normal pressure for people without sleep Apnea?

[Goofproof]

And how does this even matter m unless you can control weather on your planet? Looks to me like your time could be better spent tweaking your XPAP needs. Now for th ed real questions, why does the pressure of the air change, not really that doesn't matter, only thing's you can control matter, and the body is flexible and can adjust to a range of needs. jim