I came across an interesting (and somewhat frightening) article in the NYTimes on June 10 withthe headline "Sleep Effect Found in Parkinson's Drugs". The article can be found at www.nytimes.com/yr/mo/day/news/national/science/hlth-parkinsons-drug.html.

The drugs discussed are Mirapex and Requip are the article reports traffic accidents due to some somnolence due to these drugs