Negative influence of L-dopa on subjectively assessed sleep but not on nocturnal polysomnography in Parkinson's disease.

Background: Sleep disorders are highly prevalent among patients with Parkinson's disease (PD). Chronic medication with L-dopa may be one of the factors that contributes to poor sleep quality. The aim of this study was to assess the effects of long term use of L-dopa on objective and subjective measures of sleep quality in PD patients.