Background:The most common complaints of women after a caesarian section are pain and sleep difficulties. Pharmacological and non-pharmacological treatments can be used to treat postoperative pain and poor sleep quality. Aim: to evaluate the effectiveness of applying Jacobson's progressive relaxation technique on postcesarean section pain and sleep quality. Subject and method: Design: A quasi-experimental design was utilized. Setting: The research was carried out at the Al-Azhar university hospital's post-partum ward in New Damietta, Egypt. Subjects: A convenience sample of 100 women, 50 for the study group and 50 for the control group Tools: Five tools were used before and after applying Jacobson's progressive muscle relaxation technique on postcesarean section. Including, Women's interview questionnaire sheet, Visual analogue pain scale To assess pain severity, To evaluate the intensity of sensory and affective components of pain, a modified version of the Johansson Pain-O-Meter was developed. To assess subjective sleep quality, the Groningen Sleep Quality. Results: When compared to the control group, Progressive relaxation technique significantly reduced pain severity in the Visual analogue pain scale and the Modified Version of Johanson pain O_ Meter, and fewer than a quarter (16%) of the study group had poor sleep quality compared to 90% of the control group. Conclusion: progressive relaxation technique had improvements in women's knowledge and practice, as evidenced by a reduction in pain and an improvement in sleep quality.Recommendation: progressive relaxation technique should be included in normal postoperative nursing care for women who have had a caesarean section.