narcolepsy
"I have used Provigil for about 4 years now and I really like it.  I feel completely normal when I take it. In fact the only time I notice the drug is when I forget to take it.  However, it is costly but I did find a substantial discount in my insurance's mail order program.  Also, for someone who asked earlier, I stopped taking Progivil as soon as I found out I was pregnant. There is too little known yet and my kid was not going to be the Gineau Pig.  Surprisingly, something changed because of being pregnant and I did surprisingly well for thoes 8 months. I just made sure to take regular naps."