I've been using a CPAP since the beginning of June. I changed from a nasal mask to pillows which is better. And maybe it helps, based on how I felt after one night when I didn't use it. BUT. But, I wake up about every 2 hours, on average. And I end up shutting it off when I wake up early morning, about 5:30 or 6. So I may be in bed 6 hours and only log 4 hours on it. And I'm told the 4 hours should be asleep, not just wearing it 4 hours. I would hate to think I am struggling with this and not even getting the medical benefit I need. How long has it taken you to adjust to a CPAP, especially without waking up during the night? I know a sleep cycle is about 90 minutes long and everyone has some type of cortical arousal at the end of it, but not conscious wakenings. How long can it take? Oops, I thought of another question. If you have been in the hospital after starting CPAP and they have known you have sleep apnea, have you brought your machine or have they made you use one of theirs? I'm wondering whether I will be forced to use one when I have surgery. It seems like it would be enough to deal with the after effects of the surgery, unless the pain meds really take away all pain.