Hi All, I'm new here, in the U.K., 57 years old, of average build, and have recently started using a Philips Dreamstation CPAP. 'Recently' meaning I've had 9 nights with it. My sleep study AHI was 19, and according to Philips it's now down to around 1.5. I'm assuming that the AHI figures from the study are directly comparable to the device. If not, then how do you compare them? Not sure yet whether it's my imagination or not but the feeling first thing in the morning of doing a round or two with heavyweight boxer seems to be receding! Which has got to be good. Throughout the day, too I'm not feeling quite so wiped out, and I've restarted the gym visits. Eventually, I'd like to get back to cycling and doing 50-60 mile rides which seem a lifetime since. Regards, MTD.