Background: The aim of the present study was to assess sleep quality in patients with type 2 diabetes mellitus. Materials and methods: The present case control design was conducted among 100 diabetic patients and 100 non diabetic age matched controls presenting to internal medicine OPD. Pittsburgh sleep quality index was used to assess the sleep quality and disorder of the patient. Biochemical indices included HbA1c levels. There after the data was collected and analyzed statistically to determine any co-relation between sleep quality and glycemic status. Results: BMI was found more in case group as compared to control group with statistically significant difference as p<0.05. FBS, PPBS (mg/dl) was found more in case group as compared to control group with statistically significant difference as p<0.05. Mean HbA1c among the case and control group was 9.51±1.35 and 4.97±0.76 respectively. According to Pearson correlation analysis, statistically significant correlation was found between sleep quality and age, BMI as well as HbA1c i.e. with increase in age, BMI, HbA1c, poor sleep quality also increases. Conclusion: The study concludes, that sleep quality was poor in diabetic patients and there is a significant association between diabetics and sleep quality. Majority of patients with type 2 diabetes mellitus were suffering from poor sleep quality.