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Background:Parkinson's disease (PD) is a common progressive neurological disorder involving 1.7% of the geriatric population in China and 2.0%of the elderly population globally, respectively.There are no specific neuro-imaging modalities and reliable biomarkers for the diagnosis of PD until now.PD is usually diagnosed clinically based on the UK Brain Bank criteria, which are composed of 4 aspects mainly referring to motor symptoms, including bradikinesia,rigidity, rest tremor and postural instability.Depression,dementia, drug-induced psychosis, impulsivity and sleep disturbances may complicate the course and management of PD and lead to a variety of short-and long-term negative outcomes.Recent studies have focused on non-motor symptoms besides motor signs.Non-motor symptoms such as sleep disturbances and mood disorders are common in patients with PD.Sleep disturbances have been reported to occur in 90% of patients with PD.However, the relationship between non-motor symptoms and motor symptoms was not clear in Chinese patients with PD without dementia.Object: In this study, we sought to investigate changes in sleep in Chinese non-demented PD patients and further study the relationship between sleep quality and PD.