narcolepsy
"My little sister was diagnosed about 2 years ago with Narcolepsy, just recently, so was I. My doctor gave me a sample of Nuvigil for 4 weeks, and a prescription for Aderol. I took Nuvigil and I felt great! However, I took the medicine at about 5:30 am and could not turn my brain off or get to sleep until after 1:30 am. I then took half of the pill to maybe reduce the time it keeps me awake, but nothing happened at all. In reading some of the comments here, it sounds like maybe this medicine will wear off quicker in the future."