The aim of this study is to investigate the possible risk factors of poor sleep quality among patients with type 2 diabetes mellitus on insulin therapy. The factors considered were age, sex, body mass index (BMI), glycosylated haemoglobin (HbA1c), duration of diabetes and depression. A total of 202 diabetic patients aged 20 years or older were included in the study. The results showed that female sex and depression were independent risk factors for poor sleep quality among type 2 diabetics on insulin therapy. Findings may contribute to sleep disorder control in female patients with type 2 diabetes mellitus which has been linked to glycemic control. A. Sathyanarayanan et al. 207 activity are designed to prevent and manage diabetes and its complications. New strategies against the disease are needed. This is vital for the development of more efficient methods to counteract the progress of the disease and channelize our efforts directed at changes which most affect the disease. One component which is shown to have an impact is the relationship between diabetes and sleep quality [2]. Studies in other parts of the country have reported that short sleep duration or poor sleep quality may relate to glucose metabolism. Insulin administration was reported to be an important reason for the prevalence of sleep abnormalities. Data suggest that diabetes is associated with periodic breathing, a respiratory abnormality associated with abnormalities in the central control of ventilation, which in turn affects sleep [3].This can have many ramifications over the course and treatment of the patients who are on chronic insulin therapy. Not many studies have examined the factors associated with poor sleep quality in patients with type 2 diabetes using insulin. A recent study was conducted including 140 type 2 diabetics on insulin therapy. The possible risk factors that were considered in the study were age, sex, BMI, HbA1c, duration of diabetes and global PSQI score [4]. The results of the study showed poor sleep quality in females type 2 diabetes patients with insulin therapy. However, in this study depression was not considered which might confound the findings. In addition, many studies have reported a higher prevalence of depression among patients on insulin therapy [5]- [7]. The aim of the present study is to examine the factors associated with poor sleep quality among type 2 diabetes on insulin therapy. The factors considered were age, sex, BMI, HbA1c, duration of diabetes and depression.