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%. Common sleep problems in PD included insomnia, excessive day time sleepiness, REM sleep behavior disorder (RBD), sleep apnoea, periodic limb movements and sleep attacks. Within dyads, significant correlations were found with depression, anxiety and carer burden relating to night time care in particular. Despite the negative impact of sleep disturbance in PD, the evidence-base for treatment remains limited. While addressing individual factors associated with sleep disturbances, it is also important to emphasize the needs arising from the patient-carer dyadic relationship. While a number of non-pharmacological interventions were suggested in the literature, further well-controlled trials are still required. Multiple approaches are required to reduce sleep disturbances and associated burden in PD.