This fascinating, thought-provoking study discusses the central role of sleep in our lives. After probing the scientific literature, T.S. Wiley and Formby, researchers at the Sansum Medical Research Institute, conclude that, "the disastrous slide in the health of the American people corresponds to the increase in light-generating night activities and the carbohydrate consumption that follows." Our internal clocks are governed by seasonal variations in light and dark; extending daylight artificially leads to a craving for sugar, especially concentrated, refined carbohydrates that, in turn, cause obesity. More seriously, lack of sleep inhibits the production of prolactin and melatonin--deranging our immune systems and causing depression, diabetes, heart disease, and cancer. The authors prescribe sleeping at least nine and a half hours in total darkness in the fall and winter and switching to a diet low in carbohydrates and high in protein, vegetables, and healthy fats. They support their arguments with 100 pages of notes and by tracing the progression of disease from hunter-gatherers to our high-tech society. Despite its somewhat strident, all-knowing tone, this illuminating work is highly recommended for academic and public libraries.