when I was first diagnosed my Pulmonologist said he wanted me on 3 liters continuous at home and when going out and walking on 5 liters. My insurance wouldn't cover a POC but did cover a stationary for at home and "E" tanks for going out. So I bought a POC myself. My Pulmo had to know about it because I needed him to write a prescription for it. My Pulmo never said anything about use continuous when sleeping and I never did ask him if it was ok to use my POC. When at home and sleeping I always use the stationary concentrator, but a time ago when on a short trip I slept with my POC, I think for 4 nights, no problems. We've been on longer trips but I took my home stationary concentrator on those for sleeping. I will ask my Pulmonologist at my next appointment but until then what do any of you guys think of this, of sleeping with a POC?There are other women that I would, woo, I mean POC's that I would, oh you know, when going to bed to go to sleep.