narcolepsy
"I have been taking 250 mg of Nuvigil every morning for a year. I could not stay awake at all before starting this medication. After taking Nuvigil I felt much better. I have had a lot going on lately and stress does affect how this medication works for me. If my sleep pattern is disturbed (have to get up extra early or go to bed really late) it also has a huge impact on how this medication works for me. Overall this medicine has given my quality of life back. "