I have the CPAP machine and it does take time to get use to. However, I am not allowed to have surgery wihtout have used the machine for five hours for two weeks. So that is something else that you may need to consider. The reason behind it is because people were having a hard time waking up from anesthesia. I have noticed that I am well rested when i get up in the morning and I dont have the headaches that I use to have when i wake up....but I guess to each its own and what your insurance or surgeon is saying...best of luck