Hi Imurmama, and thanks for posting the question. As my colleague, John, has said - it is a good one!
Like John, I have not heard of CPAP therapy being used in the treatment of asthma. In fact, CPAP is sometimes prescribed for folks who have obstructive sleep apnea, which is generally treated during the nighttime (sleep) hours. I see that John has provided a good reference for that type of treatment.
Do you think it's possible your physician has suggested the CPAP therapy for some time of sleep disorder you may have?
You may want to speak with your physician to find out why you are on CPAP therapy. What do you think?
All the best,
Leon (site moderator asthma.net)