From what I remember-my Oxygen level was down to 92%-or less- when I stopped breathing.
I started with the nasal pillow-then slept with my mouth open. Switched to a full mask. Never had an issue after that.
My Cpap
https://www.resmed.com/us/en/healthc...e-10-cpap.html
Insurance pays for much of it. Always a deductible. I am on a loaner-my first one had the motor making bad noises. Have not heard about replacement yet. It was only 2.5 years old. And have to check to see if insurance pays for repairs.
The three days without it was terrible.
The alternative is worse.