I have had my CPAP machine for about 8 months now and I don't know how I slept without it. Well I guess I wasn't. Any way it is true, it is kinda hard to get used to, but it does make a huge difference! I don't have any headaches anymore and I feel better throughout the day. I did not lose any weight while using the machine, there were some months that I gained. All the while I maintained an increase in energy. I had my surgery on the 22nd and I am still using the CPAP machine, I think it will be hard to stop using it, to be honest.