it shouldn't be hard to expand the tank, or to wake up long enough to pour more water in it. I rarely go more than 4 hours without waking up completely, but that may be unusual.

I find a definite difference between "waking up, then turning over and going back to sleep" and "waking up, getting out of bed, turning on the light, fiddling with mechanical devices for a few minutes, then going back to bed."

What part of your body is causing the apnea?

No idea. My guess would be nasal, just because I am chronically congested.

I really need to take more charge of my health care, and stop letting doctors treat me like a piece in an assembly line...

I assume you've tried the nasal antihistamine spray, Astelin?

Never even heard of it. Is it OTC? I am going to see an allergy specialist in April, regardless of how the CPAP business goes.