In light of current pressures within formal social care services, informal carers assume an important role in meeting the care needs of a growing number of older people. Research suggests relationships between care-giving and health are complex and not yet fully understood. Recently, wide-ranging associations between sleep and health have been identified, however, our understanding of the links between care-giving and sleep is limited at present. This study assesses longitudinal patterns in co-resident care-giving and problematic sleep among older people in the United Kingdom.