A Randomized, Controlled, Double-Blind, Cross-over Study of Zolpidem for Patients With Parkinson's Disease A Randomized, Controlled, Double-Blind, Cross-over Study of Zolpidemfor Patients With Parkinson's Di ...
Parkinson's Disease
Drug: Levodopa;Drug: Zolpidemfirstdose;Drug: Zolpidem second dose;Drug: sugar pill