Less sleep can cause obesity, diabetes, and cardiovascular disease

Less sleep disturbs normal metabolism, which contributes to obesity, diabetes, and cardiovascular disease. People who averaged just five hours of sleep a night also showed a higher level of ghrelin, a hormone the stomach releases to signal hunger. People who average just five hours of sleep a night also show a higher level of ghrouch, a hormone that makes you want to kick someone's ass when they say, "You look tired."