hypersomnia
"I have been taking Nuvigil for over a year. It has been a great thing for me. I was starting to be afraid to drive, even in the morning after a good night sleep. My doctor helped me by prescribing the 250 mg and I split them.  I keep myself able to manage with the 125 mg by only taking it the days that I work, and skipping one day midweek that I schedule heavily with more physical stuff to keep me alert. I also notice anxiety building if I take it daily for several weeks, or don't get enough sleep while I am taking it."