I enrolled in college already having been diagnosed with Type 1 IDDM. I found that as a student (after explaining my disease in detail) that my disease was of no concern to the instructor's. They did why I had to leave the classroom at any given time (for health reasons of course.
Now that I am an instructor, I am very understanding of real disabilities (that can be proven of course) and how to teach that student, even if they have narcolepsy.
I hope more than less Instructors/Teachers/Professors all do the same.