narcolepsy
"I noticed a lot of complaints about nausea. Do not eat anything for at least 2 hours before you take it. When I first started taking it I would wake up pouring sweat and throwing up. I finally figured it out though. If I take my first dose at bedtime, I fight it and don't sleep. So what seems to work now is going to bed and a couple hours later then take dose (I always have to pee anyway). "