I have been narcoleptic since high school. I was only diagnosed with it 8 years ago (I am ~40), so I actually lived with it for around ~15 years undiagnosed. In that time, I graduated high school, college, and went into a career.
So, with the preliminaries out of the way, and in a effort to contribute to the AMA comm:
Being medicated has been enough to keep me functional. Except for when I’m stressed, didn’t get enough sleep (like coming home late from a recent trip and having to wake up for work in the morning), or when the conditions are just right, I am pretty much “sleep attack” free.