Thanks to the people who replied - I'm going back to my sleep clinic next week for reevaluation!

Thanks for the thoughts, LSAT. I did have an overnight sleep study after my surgery, plus an overnight oxygen saturation test. Oxygen levels were good, and apnea much reduced, but I still wake often with minor congestion, usually have a headache about 4AM, and feel lousy in the morning. Does CPAP de...