I think it's more a head structural issue, which would be inherited. You're sleepy! You're oxygen-deprived! You're not thinking straight! I am claiming this for my excuse! Really, that first night, I felt clear-headed behind my eyes in the morning, I could breathe with my mouth CLOSED for two days after! THIS is why I only swim on my back! The sleep dr and my pdoc said it even helps depression - I felt pretty buzzed. I chose the full face mask option, which looks kinda science-fictiony - I told the nurse it would work for when we play Cowboys and Aliens in bed - she said, oh, how often do you play that? I go, it'll be all the time, now!