narcolepsy
"I was diagnosed with  Narcolepsy 1990. They started me on Ritalin, which did not work for me. Then Dexedrine. It did work but caused a lot of tension in neck shoulder back in the evenings. Then Provigil, Nuvigil. I have settled on Adderall, it wakes me in the morning and keeps me awake in the afternoon. It's a God send."