I use one. Recently I thought I could do without it and woke up with a terrible headache. They say that is from not enough oxygen during the night. I could not use the plastic masks, (tried several), but they have a cloth one that only covers your nose, and I can sleep with it. I have had trouble sleeping for years, but now sleep much better. It will take awhile to get used to it, don't give up!
Alicia