narcolepsy
"I was diagnosed with narcolepsy several years ago, but probably suffered from it for 12 years or so. I never stayed awake in classes. Once I started full time work, I had to get it under control. I used Provigil for a while first, but it was harsh: came on strong, I felt buggy, severe migraines, and I crashed hard after about 8 hours. I switched to Nuvigil (150mg) though it's more dollars was told it had a slower release which may help with the migraines and bugginess. I like the Nuvigil a lot better. It comes on a little more gently, I crash less at the end of the day. I do self-moderate, often don't take it on the weekends, I'll only take a half pill some days. "