Introduction: The elderly population has become a global phenomenon. Almost every country in the world is experiencing an increase in the elderly population There are 703 million people in the world who are 65 or older. An elderly person will require more time to fall asleep and will experience less or shorter deep sleep. Factors that affect sleep disorders include age, history of illness, drinking coffee, and smoking cigarettes. To improve sleep quality in the elderly, a deep breathing relaxation technique, specifically the box breathing relaxation technique, is required. Aim: Research to identify the effect of box breathing on sleep disorders in the elderly at Tresna Werdha Social Institution, Bekasi City. Methods: In this, the quasi-experiment design was employed, which included a non-equivalent control group pretest-posttest design with an intervention group and a control group. The sample size in this study was 62 respondents and was divided into two groups, including 31 elderly people in the intervention group and 31 respondents in the control group. Results: It can be seen that the average difference in posttest minus pretest scores (posttest-pretest) or expressed as ∆ mean in the intervention group of 5.29 and in the control group of 0.32. With a p value of 0.000 (p>0.05), there are statistically significant differences in social sleep disorder in the elderly in Tresna Werdha Bekasi City in 2022 between the intervention and control groups. Conclusion: The box breathing technique can be an effective intervention to improve sleep quality in elderly individuals. The results showed a statistically significant improvement in sleep quality.