This is all very interesting. I have been diagnosed with Parkinson and am on Mirapex. I take 3m. a day and I have dosed off numerous times while driving. I have sleep apnea and had gained some weight and my neurologist seemed to think that was the reason and increased my cpap setting. It has helped, but I still have daytime sleepiness. It really helped my RLS initially, but now it seems to be wearing off. I knew about the compulsive behavior, etc, but I did not know it could cause excessive daytime sleepiness. I see my neurologist next week and I intend to talk to her about this.