Non-pharmacological therapies for sleep disturbances in people with Parkinson's disease: A systematic review.

The non-pharmacological intervention types and sleep-related measured outcomes were heterogeneous. Most therapies had inconsistent effects on sleep. The insufficient evidence for non-pharmacological treatments seems related to the unique motor-associated clinical features of PD, which restrict the use of physical exercise therapy, or to individual "wearing-off" periods, which limit group therapy. Further studies on non-pharmacological therapies are required to identify the best interventions for improving sleep quality in people with PD.