Clinical research has linked obesity with problems around sleeping well. A dose-response relationship between sleep deprivation and obesity has been found. Simply, less sleep is tied to chances o increased obesity when measured by body mass index (BMI)—weight in kilograms divided by height in meters squared. Most often studies are cross-sectional; one prospective study was a 13-year cohort research that observed approximately 500 adults. NIH reports that By age 27, individuals with short sleep duration (less than 6 hours) were 7.5 times more likely to have a higher body mass index, after controlling for confounding factors such as family history, levels of physical activity, and demographic factors.