narcolepsy
"I have taken 250mg daily of Nuvigil for two years now. Without/before it I couldn't think straight, I dropped stuff, couldn't perform the simplest daily functions. Nuvigil has given me my life back! I couldn't drive for a year, I can now. My narcolepsy is pretty bad and if I miss one day of the Nuvigil I can't function. By the afternoon I can't stay awake or hold on to anything. The other medicine I was on didn't even compare to Nuvigil!"