When you're awake? 'cause people who have sleep apnea don't usually have any trouble breathing whatsoever either. Use your phone to record a nights sleep, or at least SOME sleep, and you might hear: snoring, no breathing, sudden panicked gasping for breath, all without waking up. Or hopefully, just the snoring. Also, you were great in Sin City. :)
You can be completely fine while awake, but still have apnoea while asleep. If you are sleeping that much and not feeling refreshed, it definitely seems like something to get checked.
Depends on how old you are, really. For a young guy like me it's no issue, i just didn't get much rest, since during the night my blood oxygen level was like that of an 80 year old. Once you're elderly though it can easily lead to an untimely demise.