hypersomnia
"I have been on Nuvigil for several years for alertness, or lack thereof, and attention issues.  I have had little side effects and don't think I could function properly without it.  Initially, there was a bit of insomnia for a few days, but that passed and all is well since.  Last week I ran out and had to wait a week to get the script through the mail. Ugh! I could not get up in the morning after 8-9 hrs of sleep, I walked around all day in a fog and was afraid I would fall asleep at work. This continued throughout the week and did not seem to get any better.  Finally, my medicines came in, took it this morning and it was like the sun had come out and could function again.  Not all medicines work for everyone, but for those it helps it is a lifesaver!"