Dear Pamster!
I just disconnect the hose from the mask when I have to use the bathroom. I hope that yours has that option. Believe me when I tell you that if the power goes off you will know it!

I am so used to mine now I am able to sleep on my sides and stomach. (just still takes time for me to fall asleep) A hint or two, get some Vicks Vapor Rub and swab a bit where the hose connects to the mask. This will sure help to clear your sinus. For dry mouth I suck on a piece of hard candy and chew it up when I feel sleepy.