<p>Sleep quality significantly impacts physical and mental health. Given the importance of emotional health particularly for older individuals, the relationship between sleep quality and emotional well-being among the older adults in Kermanshah City was examined.&#xa0;A correlational study was carried out through an analytical approach with participation of a group of older adults from Kermanshah in 2023. Four hundred participants aged 65 and above were selected through a multistage sampling process incorporating clustering and simple randomization methods. Data collection tools were demographic forms, the Pittsburgh Sleep Quality Index, and assessments for positive and negative effects.&#xa0;There was an equal gender distribution in the participants, with a mean age of 76.51 years. The mean sleep quality score was 8.9, with mean scores for positive and negative emotions equal to 29.65 and 25.86, respectively. In addition, 90% of participants reported poor sleep quality. A strong and significant inverse correlation was found between sleep quality scores and positive emotional states (<i>r</i> = -0.69); and a direct, strong correlation with negative emotional states (<i>r</i> = 0.73).&#xa0;There is significant correlation between sleep quality and the emotional states of the older adults. Improved sleep quality may enhance emotional well-being. Developing effective interventions is crucial and necessary. Such measures could substantially contribute to the well-being in this age group, potentially reducing healthcare costs and the social burdens of related issues.</p>