MSN: Can Lack of Sleep Cause Weight Gain | The Science Between Sleep, Hormones, and Weight Can Lack of Sleep Cause Weight Gain | The Science Between Sleep, Hormones, and Weight Science Daily: Lack of sleep can increase the risk of cardiovascular disease NBC New York: 5 reasons you're always tired—it's not lack of sleep: Tired and sleepy are ‘different issues,' psychologist says 5 reasons you're always tired—it's not lack of sleep: Tired and sleepy are ‘different issues,' psychologist says