Aims The current study was conducted to investigate the effectiveness of psychological interventions (mental-educational) on the quality of sleep among patients with chronic diseases in Iran during 2003-2021. Methods & Materials The current study is a meta-analysis in terms of purpose. The population included all master’s and PhD. dissertations and theses, studies published in scientific journals, and studies published by Iranian authors living abroad. The instrument applied for the analysis of the data was the meta-analysis checklist, and the stages of the meta-analysis were conducted according to the technique proposed by Howitt and Cramer (2005). Findings After investigating 57 studies, 31 studies including 1813 participants were found to meet the entry criteria. The results showed that the total effect size is 0.99. The compound level of significance related to the studies was found to be P<0.0001, which indicated the significance of the total effect sizes obtained in the psychological studies on the quality of sleep among patients with chronic diseases. Conclusion The effect size of the psychological interventions conducted on the quality of sleep among patients with chronic diseases in Iran is high according to Cohen’s table. Hence, implementing this novel therapeutic approach can be considered an effective method in the enhancement of the quality of sleep in patients with chronic physical disease.
