Aims To understand sleep as part of the 24 hour provision of resident care by viewing it in the wider social context within the care home, exploring both the subjective experience of residents and the perceptions of staff. Methods Qualitative research in four care homes for older people consisting of semi-structured interviews and ethnographic observations. Interviews were conducted with 38 residents and 39 staff, and were analysed using a grounded theory approach. Findings The findings have highlighted some challenges and opportunities for developing practice in care homes to improve residents' sleep. In addition to pain and physical disabilities, both the physical environment and practices in care homes can affect residents’ sleep and night-time experience. Conclusion Improving our understanding of residents’ and staff experiences at night in care homes can inform the development of good practice in night-time care and contribute to a positive culture of person-centred care