When I went in for my sleep study, they woke me two hours in to tell me I was a damn mess. Then they put me on the CPAP machine and told me to go back to sleep. That first night, I got five hours of shut-eye with the CPAP machine. Even though I’d gotten 10 hours without it the night before, the CPAP sleep was far superior. After years of not being rested, it was like when you clean smudge off of glasses: you could see everything OK before, but once the smudge is gone you realize how much you were really missing.