The aim of this descriptive study was to examine the sleep quality of older adult nursing home residents and the factors that affect it. The research population included all of the older adult residents of three nursing homes (n = 992) in Izmir, Turkey. The sample comprised those who met the inclusion criteria for the research and agreed to participate (n = 540). Research data were collected using the Elderly Individual's Introduction Form and the Pittsburgh Sleep Quality Index (PSQI). The mean age of the residents was 75.49 (SD = 6.56 years), and 54.1% were women. The sleep quality for the majority of the residents (60.9%) was determined to be poor. Nurses can enhance older adults' quality of sleep and therefore improve their quality of life.