shift work sleep disorde
"I've taken Provigil in the past for over 8  years due to severe IBDH & shift sleep disorder.  When Nuvigil came out on market, my neurologist gave me samples to try.   I found it AMAZING & much cleaner version, as I don't notice significant side effects.  Most importantly - the abrupt feelings when it first "kicked in" in the mornings and sudden halt from wide awake to severe sleepiness. Less agitated and very clean even transition from its predecessor Provigil!"