The House voted 308 to 117 on July 14 to make daylight saving time permanent, ending the twice-yearly clock change - a bill its backers, and the President, sold as a win for health, mood, and daily life [2]. On the health claim specifically, the medical consensus points the other way.
The American Academy of Sleep Medicine, in a position endorsed by more than twenty medical and scientific organizations, and the American Medical Association both recommend the opposite of what the bill would do: year-round standard time, which they say best aligns with the body's circadian clock [1]. Permanent daylight time keeps the clock 'sprung forward' through the winter, pushing sunrise later - the AMA notes that 64 percent of surveyed parents worried their children would travel to school before dawn under such a system [1].
The evidence the doctors cite is not abstract. The spring 'spring-forward' transition - a single hour of lost morning light - is associated with more cardiovascular events and more emergency-department visits in the days that follow [1]. There is also precedent for how permanent daylight time goes over: the United States adopted year-round daylight time in early 1974 and, amid backlash over dark winter mornings, repealed it within the year.
Making daylight time permanent may well be popular - lighter evenings have obvious appeal, and reasonable people can want them. The claim at issue is narrower: that it is the healthier choice. On that, the sleep and medical societies are close to unanimous, and they land on standard time, not daylight time [1]. A bill can deliver brighter evenings or better-aligned mornings. The record says it should not be sold as delivering both [1].
