Yea, I think that's what I'm going to have to do.
On nights where I know I'm doing something fun or exciting the next day I can wake up at 5am sharp, no alarm clock. School mornings... an entirely different story.
I'd ask for a sleep study with MSLT (nap test). I take stimulants to keep me awake. Even so, if something exciting is happening I do wake up. I'm not terribly functional but I wake up. I have no memory of not being tired (even on a lot of stimulants).
Anyway, please see your doctor.