Abstract: Objective To investigate the correlation between sleep status and cognitive function in the elderly in Shenzhen. Methods The data was collected from the survey results of elderly who underwent physical examination in hospital of Shenzhen. The Pittsburgh sleep quality index scale （PSQI） and the simple mental state scale （Mini-Cog） were used to evaluate the sleep status and cognitive function. Logistic regression was used to analyze the correlation between sleep status and cognitive function. Results A total of 7 510 subjects were included, including 43.5% males and 56.5% females, 68.4% aged 60-69 and 28.3% aged 70-79. Only 14.9% of the elderly had education level of primary school or below, 87.5% were married, 79.5% never smoked, 85.6% never drank, 81.4% had regular exercise in the past half year, and 17.9% and 10.5% of the elderly were found to have poor sleep quality and cognitive dysfunction. Multivariate Logistic regression showed that the sleep disorder （OR=1.250） and daytime dysfunction （OR=1.128） were risk factors of cognitive dysfunction. Conclusions leep quality is a factor affecting cognitive function of the elderly. Good sleep quality may play a certain positive role in cognitive function. It is suggested that healthy sleep knowledge and cognitive knowledge publicity activities should be carried out in the community to improve the quality of life of the elderly population.

Key words: Sleep status, Cognitive function, Elderly