It is well known that dopaminergic treatment closely interacts with SWD. This study aims to assess the effect of Rasagiline on SWD in PD patients. In this randomized, double-blind, placebo controlled study in clinical phase IV, 60 subjects will be treated with rasagiline 1mg po once daily or placebo over 8 weeks. The study is planned to be conducted in 6-9 Swiss centers. Questionaires will be used to assess SWDs: sleep disturbances (Parkinson's Disease Sleep Scale, PDSS), daytime sleepiness (Epworth Sleepiness Scale, ESS), fatigue (Fatigue Severity Scale, FSS), apathy (Apathy Evaluation Scale Self, AES-S), disability (Sheehan scale) and QoL in PD patients.