03/06/2012 02:16 pm ET

Too Often, Doctors Overlook Narcolepsy

Clea Howard is hardly a tuned-out, disinterested high school student. She likes to be busy: In addition to maintaining an excellent scholastic record at a demanding high school an hour from her Brooklyn home, she studies art, takes dance classes and plays soccer.

Yet during her freshman and sophomore years, she was always tired, no matter how much she slept at night. She often fell asleep in class, on the subway, while doing homework or talking to her boyfriend.

Read more on nytimes.com