The authors have gathered conclusive research to support the theory that when we don't sleep in sync with the seasonal variation in light exposure we fundamentally alter a balance of nature that has been programmed into our physiology since Day One. When extended day length created by artificial light became the norm seventy years ago, obesity, diabetes, heart disease, & cancer became major killers in America. When we stay up late, we're telling our bodies to prepare to hibernate. This increases our biological need to eat carbohydrates in order to store fat food & insulation for the coming winter. In this hormonal state, the urge to consume carbohydrates or drink alcohol to put on a fat-base becomes metabolically impossible. That's why American's are eating themselves to death-they're tired.Wiley, T. S. is the author of 'Lights Out' with ISBN 9780671038670 and ISBN 0671038672.