I took mine in with me. Since being diagnosed in 2002, I can count on one hand the number of times I slept without it. I brought it into the hospital, after looking it over to make sure it was going to be safe (yeah, they do that), they gave it to me when I came out of surgery. ANY time I was in bed, I had it on. I like it, it makes it easier to breathe, and I was okay with it.
Since then, I've even turned the pressure down once or twice, but I still use it.