I have an APAP which changes the pressure as needed. I started with the CPAP where the pressure is continuous, but ended up with bloating and worsening of my IBS. I was getting too much air pressure when I didn't need it.
I have been amazed how much the APAP has helped my sleep. This being said, I still have FM, RLS and difficulty getting deep sleep so the improvements are relative. I found the the symptoms of morning depression, morning headache as well as being able to sleep better at night because with help with the Nuvigil, I stay up longer during the day and that helps me sleep better at night were the symptoms that the APAP really helped.
I found the following site very helpful. I've only posted a couple of times with questions and was impressed with the answers as well as follow up to see how you are doing. The site is affiliated with The American Sleep Apnea Association.
http://www.apneasupport.org/
It's important to get a sleep doctor who is certified through the American Association of Sleep Medicine. I know someone who was told she didn't have OSA because she wasn't fat. This is not true. Over 50% of people with Sleep Apnea are not obese. She went to a sleep doctor and it turned out that she did indeed have OSA. There are lots of myths about OSA which are covered in the above site as well as people having difficulty with using the CPAP.
Untreated OSA can turn into Central Sleep Apnea which is very serious. It can also be dangerous to your health.
Compliance is the number one problem using the CPAP.
I don't use the dehumidifier as it would smell musty, sometimes I would get the backspray and just inconvient. I use a non dye My machine is compact and not noisy.
BTW, I was really surprised when my sleep neurologist suggested I had sleep apnea. I had no idea I was waking up 51 times an hour during deep sleep.