Chronobiology--the study of body time--may revolutionize your life. Bodyrhythms by veteran medical writer Lynne Lamberg is a comprehensive, eminently readable report on advances in maximizing daily alertness, avoiding errors at work and on the highway, and treating mood and sleep disorders and other illnesses. It is no accident, Lamberg says, that the Exxon Valdez, Three Mile Island, Chernobyl, and Bhopal disasters occurred at night. Or that doctors, nurses, pilots, truckers, train engineers, and other workers make more mistakes--sometimes fatal mistakes--on the night shift. Unlike many other countries, the United States has no laws governing work and rest hours that acknowledge that when people sleep may be even more crucial than how long they sleep in determining their performance and well-being. Bodyrhythms makes a compelling argument for workplace reforms.