Sleep disturbances are a debilitating non-motor symptom in Parkinson's disease (PD) and negatively impact patients, their carers and the patient-carer dyadic relationship. This review outlines the phenomenology, as well as factors associated with and treatment of sleep disturbances, in PD patients and their informal carers. The following terms were used in four databases: Parkinson*, sleep* disturbance*, carer*, dyad*, intervention* and treatment*. Across the articles reviewed, the frequency of reported sleep disturbances in PD ranged between 60% and 98%.
