Hi @lolaemma, I don't use a BiPAP but I have similar breathing problems with one or both nostrils due to a deviated septum. I frequently use a nasal wash before I go to bed but it doesn't always clear my nasal passages. I've also resorted to putting some CPAP non petroleum based skin moisturizer inside both of my nostrils and found it helps keep them open. I think it's because it has some Aloe Vera and sort of acts like Vicks (that stinky stuff) my mother used to rub on the chest when I had a cold. I've thought about getting a septoplasty but at 77 I'm just not sure I want to go through the pain.