............Ink u will get used to it, then never really know its on.....I thought that I would never get used to it, but it wasn't to bad after the first few nights......in fact I have a hard time sleeping without it......I have the resmed elite 2 and the comfort gel nasal mask...........I tried having a humidifier in the room for 3 years, worked not bad I thought, then I got the humidifier attachment for my machine, what a difference..........kim........