Research indicates that poor sleep is associated with postpartum depression; however, little is known regarding this relationship among postpartum women who are at high risk for postpartum depression. This study examined the relationship between changes in self-reported sleep patterns (from six weeks to seven months postpartum) and depressive symptoms. To investigate the relationship between sleep quality and postpartum depression, as well as its impact on emotional reactions, through a systematic review of existing research papers. A thorough and meticulous review of current literature was conducted to deeply explore the topic. Numerous scholarly articles and journals which were freely accessible online, were examined. At last, 30 articles were taken into account for this review-based analysis. Key terms like "postpartum depression," "sleep quality," and "emotional reaction " were used to identify pertinent studies for a detailed analysis of the subject matter. The systematic review revealed a significant correlation between poor sleep quality and the prevalence of postpartum depression. Additionally, there was evidence suggesting that the quality of sleep directly influenced emotional reactions in the postpartum period, with sleep disturbances exacerbating symptoms of depression and anxiety. It can be established that postpartum depression underscores the importance of addressing sleep quality as a potential risk factor for postpartum depression and its impact on emotional well-being. Interventions aimed at improving sleep during the postpartum period may serve as a preventive measure for reducing the incidence and severity of postpartum depression, ultimately promoting better maternal mental health and overall adjustment to motherhood.