Follow-Up: I have recently been diagnosed with narcolepsy and have only had provigil. At fist I though it was the most wonderful thing I had ever experienced, i.e. at 20 years old I have discovered what it means to be AWAKE! Unfortunatley my wonder has been short lived, three months and 500mg dose a day later, the positive effects are wearing off. I'm not continuously tired as before but at my 'low' points during the day (8-10 2-4 6-8) are really intense. It's soul destroying after feeling so good to regress back to my old habits!!!