I'm waiting to see what its like to sleep for 8 hours in one night! LOL One thing I know is I use my machine not only every night but during naps. I really cannot go without it. For years I had mild Obstructive SA with a pressure set at 7. A recent updated sleep study revealed the SA had worsened and I now have a new machine and a pressure of 14-20. I had to go through a little tension with my doctor's office and the equipment company to get my order in a timely manner but I'm grateful. I had my old machine calibrated and use it next to my recliner where I often fall asleep watching television after a long day. This way I have no excuse not to use it anytime I am sleeping. I lost one of the loves of my life at age 45 from a massive heart attack at 4am because he refused to comply with his SA.