Background: The postpartum period is important for women and their families because it brings about physical, social, and emotional changes that increase fatigue and impact their sleep quality and quantity. The aim of the study was to examine the impact of Levin's Conservation Model nursing care on fatigue and sleep quality among postpartum women. Design: A quasi-experimental research design (a non-equivalent group design) was employed. Sample: A purposive sample of 128 postpartum women was chosen for the study. Settings: The research was conducted at postnatal obstetrics and gynecology departments associated with Menoufia University Hospital and Shebin El-Kom Teaching Hospital. Instruments: The study utilized a structured interview survey, the Visual Analogue Scale for fatigue, and the Pittsburgh Sleep Quality Index. Results: After the intervention, postpartum women in the study group showed a higher total knowledge score of 36.29 ± 3.98 on Levine's Conservation Model of Nursing Care compared to 8.37 ± 7.18 the control group. Also, after the intervention, the study group's score of fatigue dropped to 50.59±7.46, while the control group's levels remained at 82.70±7.82. Moreover, the intervention increased the total energy score of the study group to 27.25±4.20 while the control group remained at 6.18±3.13.  Additionally, the intervention led to good sleep quality for 77.00% of the study group, while only 10.0% of the control group experienced the same after 6 weeks. Conclusion: The nursing care conservation model by Levin led to a substantial rise in total knowledge and energy scores, as well as a reduction in postpartum fatigue levels. Additionally, there were enhancements in sleep quality following involvement in educational workshops. Recommendations: It is suggested to offer health education programs to postpartum women to enhance their knowledge of Levine's conservation model-based nursing care, leading to better sleep quality and patterns and decreased fatigue.