Effects on blood pressure?

When I started on cpap, my blood pressure was hard to get under 140/ ** with meds. Within 2 weeks of using cpap, my pressure dropped 20 points. There is a bunch of articles documenting High Blood Pressure and apnea on the web. I brought one off the family medicine site and showed my Dr. She was really surprised because I did not fit the "profile" of a sleep apnea patient. I have since dropped 40 lbs, and feel even better. I am not obese and my bmi is 27. Cpap does make a difference!