I ran a report for my Phillips Respironics BiPAP System One machine. The results did not look correct at all. I then noticed there had been an update to SleepyHead software so I updated, then re-imported my card data. Still wasn't correct. I went to our local DME respiratory company and had them run the data. Wow, am I glad I did. The Resmed data software showed showed I used the machine 2 hours and 10 minutes more than SleepyHead software did! I attempted to contact SleepyHead a couple of different ways but their website has a broken link in one area and says "under construction" using a different link. If a commercial truck driver or pilot used SleepyHead software to submit to their licensing agency they would likely lose their license. Not good. It's best to double check to see if you are getting accurate readings before risking your livelihood.