narcolepsy
"I found that this medicine was good at keeping my body awake, but I still felt like my mind was falling asleep.  After about 4 or 5 days on it I developed the worst migraine of my life...when I get migraines they usually resolve with just half of a Vicodin.  After taking two full Vicodin's I still had the most raging migraine ever. It lasted for 3 days. Once it resolved I went back on the Provigil two days later another raging migraine.  That was it for me. "