In the short term, a lack of adequate sleep can affect judgment, mood, ability to learn and retain information, and may increase the risk of serious accidents and injury. In the long term, chronic sleep deprivation may lead to a host of health problems including obesity, diabetes, cardiovascular disease, and even early mortality. These days, the treatment of sleep impediment speaks to a new challenge for health systems. So evaluation of factors affecting the quality of sleep has extreme significance. Previous studies have demonstrated the negative impact of high BMI on the quality of sleep. It was also stated that sleep deprivation is associated with obesity. Obesity and sleep disturbances are two major problems that adversely affecting the quality of life of humans worldwide. So this review aims to explore the association of Body Mass Index (BMI) with quality of sleep. Studies on the topic of quality of sleep and BMI will be reviewed so the findings of those articles will be used to explore the association between BMI and quality of sleep.