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THE KEY TO A HEALTHY LIFE is also to sleep well! This is very important if you want to be physically fit as well as mentally, and manage your body mass. According to a number of studies, poor sleep is a big factor in obesity. It is expected that adults who sleep poorly are 55% more likely to become obese, and children are 89% at risk of having weight problems when they sleep poorly. Lack of sleep causes a cascade of reactions, such as the decrease of leptin, a hormone that promotes satiety, and the increase of ghrelin, the hormone of hunger.