I was diagnosed with OSA back in 2002. I was put on CPAP therapy (at a pressure of 8)  BUT I did not stick with it. The machine I was given was one with a pass over (cold water in the bin). I would say I used it for about a month and then on and off as I would wake up gasping for breath. Anyhow, in May of 2006, I started having rapid heartbeats, irregular heartbeats and was being treated for atrial fibrillation. After reading about it, it can be caused by UNTREATED sleep apnea.  I had gained alot of weight and the apnea really got bad. I was constantly waking up and gasping for breath so I decided because of the severity of the apnea events and the heart palpitations, I went back to my pulmonogist who ordered another sleep study. The result were that the OSA was worse (as I had suspected). The pressure was now up to an 11. Since my machine was old and I told them I needed a humidifier, they ordered me a brand new one. My pulmonologist said to use the machine for 30 days straight (due to insurance reasons) and to follow up with her to see how I did with the therapy. I remember waking up on the day I had to follow up (30 days later) and my head felt so light (not lightheaded) but as if someone had taken a weight off my head. The thoguht hit me, "WOW, is this how my head is suppose to feel?"  I did not think anything of it except I fwelt so much better! I continued with CPAP therapy every night for about 7-8 months, then lke habit, I started to ween off of it. Before I knew it, it was March of 2007 and I had gained more weight and the apnea events were waking me up again so I went back to CPAP again. Throught 2007, 2008 and 2009, I was flucutating in my weight and using my CPAP every now and then. In September of 2009, I had some vision issues (long story - after surgery) and was told it was a condition called pseudo tumor cerebri. After much research, it can be a secondary cause of sleep apnea. I had lost 52 lbs so when I went to see my pulmonologist, they had to do another sleep study because I had lost 52 lbs. The sleep study came back and they said I did not meet the criteria to be CPAP'd during th study, whcih made me mad, because I needed to get a new tiration. I went back and ask for another study adn they did one again, smae results, DID NOT MEET CRITERIA. Since I did not meet criteria, my pulmonologist ordered an APAP with a range of 5-15.  I have been using APAP now for 5 months and just changed to a full face mask because I was having some leaks from mouth breathing. Anyhow , I am testing to see if 30 days of straight , uninterupted, leak free nights will help wihit the intra cranial pressure. Looking back at the first time I used CPAP for 30 days staright and I had that experience with my head feeling lighter, I wonder if it may take that much time or longer. Any ideas on how long therapy with APAP may take and if it can help pressure?