Objective To explore the relationships between sleep quality and cognitive functions of the elderly in community. Methods Mini-Mental Status Examination(MMSE),Wechsler Memory Scale China Revised Edition(WMS-C),Pittsburgh Sleep Quality Index(PSQI),Epworth Sleepiness Scale(ESS) were used to investigate the sleep and cognitive functions status of 203 60 more aged people who were randomly selected from a community in Changsha city. Results The incidences of sleep disorder and cognitive impairment were 55.8% and...