Dozens of medical professional organizations, including the American Medical Association,
which publishesJAMA, have endorsed permanent standard time. They argue that adverse
health effects—including increased incidence of poor sleep, motor vehicle crashes,
depression, and stroke—are seen not only in the transition period from standard time to
daylight saving time in the spring but probably until the transition back to standard time in the
fall. During those months, the body's internal circadian clock, which synchronizes to solar …