Background: Immobility refers to the inability to move about freely. The actual impact of immobilization causes various complications involving multiple systems in our body. The goals of orthopedic surgery are as follows: to improve the patient's body functions, to restore movement and stability, to relieve pain and disability, and to improve sleep. Aims and objectives: (i) To assess the quality of sleep among postoperative orthopedic patients. (ii) To assess the effectiveness of passive range-of-motion exercises on quality of sleep among postoperative orthopedic patients. (iii) To associate the quality of sleep among postoperative orthopedic patients with their selected demographic variables. Materials and methods: The study used a quantitative research approach and a pre-experimental (one-group, pre- and post-test) design. Thirty patients who had undergone major orthopedic surgery were chosen using a purposive sampling technique from the orthopedic and postoperative wards at MGMCRI in Puducherry. The Groningen Quality of Sleep Score (GOS, 17) scale was used to assess sleep quality in pre- and post-test orthopedic patients, along with passive range-of-motion exercises as an intervention. Results: The mean sleep quality before and after the test was 9.63 and 3.33, respectively. The obtained p-value p <0.001 was highly significant. As a result, the results show that passive range-of-motion exercises were extremely effective in improving sleep quality in postoperative orthopedic patients. Conclusion: The study findings revealed that passive range-of-motion exercises show empirical evidence of having improved quality of sleep among postoperative orthopedic patients. Thus, it is also highly effective and can be easily performed by all postoperative orthopedic patients.