narcolepsy
"I was taking 40mg of Adderall per day for ADD, before my Narcolepsy diagnosis. At that point the dose was raised to 30mg, 2 times per day. That dose helped a bit more with the ADD symptoms, but I'm still exhausted and sleep-walking thru my day. It does give me 4-5 hours to be productive and get my work/errands done before I crash again, around 3:30pm. I've been on Adderall for several years and at first it seemed like a miracle drug. On 20mg/day I felt awake for the first time in my life. But now, about 8 years later, I think my tolerance is way up, as the 60mg/day I take now is no where as effective as the 20mg was years ago. Until there is better treatment for Narcolepsy, Adderall is better than nothing."