I use cpap for sleep apnea. If I don't use it, I snore and wake myself up repeatedly and cannot get a restful sleep.
I have this problem regardless of whether I use Xanax or not. My oxygen levels fall without cpap, but not enough to warrant oxygen therapy at this point.
I have questioned my doctors about the use of Xanax, given its sedating effect, and they seem to be comfortable with using it as long as it will enable me to be cpap compliant.