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Introduction: The aim of this study was to explore the relationship between sleep quality and bone mineral density (BMD) of the hip in a group of young Lebanese men., Methods and Results: Fourteen Lebanese young men from 18 to 30 years (mean age 22.6 years) participated in this study. Weight and height were measured and body mass index (BMI) was calculated. BMD of the total hip (TH) and the femoral neck (FN) was measured by DXA. Daily protein intake (DPI), daily calcium intake (DCI) and sleep quality were evaluated by validated questionnaires. The Pittsburgh sleep quality index (PSQI) was used to assess sleep habits and quality; higher scores represent worse sleep quality. Weight, height, BMI, DCI, DPI and sleep duration were not correlated to BMD values. The Pittsburgh sleep quality index was negatively correlated to femoral neck BMD (r = -0.82; p < 0.001) and to TH BMD (r = -0.54; p < 0.05)., Conclusion: This study suggests that poor sleep quality affects negatively BMD of the hip in young adult men. Our findings may lead to the development of better preventive approaches to osteoporosis.