chronic fatigue syndrome
"I began suffering from Chronic Fatigue Syndrome about a year ago.  Didn't know I had it, just knew I was sleeping more than I was awake.  Just diagnosed in January and have been taking Nuvigil since then.  Started at 150 mg a day, but it wore off by mid afternoon.  Have since increased the dosage to two pills a day.   I take the second pill in the afternoon and it keeps me going for another 6 hours or so.  I haven't had to take a nap since I started taking the medication and I am able to concentrate more.  I feel more alert and can get much more accomplished during the day.  I don't have trouble sleeping or staying asleep.  This medication has been a miracle that has given me back my life."