内容摘要：Versions of the “Whole Milk for Healthy Kids Act” are pending in both chambers of Congress.

Versions of the “Whole Milk for Healthy Kids Act” are pending in both chambers of Congress.

Daylight saving time begins Sunday at 2 a.m., an hour of sleep vanishing in most of the U.S. The ritual will reverse on Nov. 2 when clocks “fall back” as daylight saving time ends.Hawaii and most of Arizona don’t make the spring switch, sticking to standard time year-round along with Puerto Rico, American Samoa, Guam and the U.S. Virgin Islands. Worldwide, dozens of countries also observe daylight saving time, starting and ending at different dates.

Some people try to prepare for daylight saving time’s sleep jolt by going to bed a little earlier two or three nights ahead. With a third of American adults already not getting the recommended seven hours of nightly shuteye, catching up can be difficult.This article is part of AP’s Be Well coverage, focusing on wellness, fitness, diet and mental health.The brain has a master clock that is set by exposure to sunlight and darkness. This circadian rhythm is a roughly 24-hour cycle that determines when we become sleepy and when we’re more alert. The patterns change with age, one reason that early-to-rise youngsters evolve into hard-to-wake teens.

Morning light resets the rhythm. By evening, levels of a hormone called melatonin begin to surge, triggering drowsiness. Too much light in the evening — that extra hour from daylight saving time — delays that surge and the cycle gets out of sync.Sleep deprivation is linked to heart disease, cognitive decline, obesity and numerous other problems. And that circadian clock affects more than sleep, also influencing things like heart rate, blood pressure, stress hormones and metabolism.

Fatal car crashes temporarily jump the first few days after the spring time change, according to a study of U.S. traffic fatalities. The risk was highest in the morning, and researchers attributed it to sleep deprivation.

Then there’s the cardiac connection. The American Heart Association points to studies that suggest an uptick in heart attacks on the Monday after daylight saving time begins, and in strokes for two days afterward.drive past apple orchards and cornfields stretching to the desert horizon. Aguirre goes door to door with a cooler

. In one of Latin America’s biggest Mennonite communities, she knows many will decline to be vaccinated or even open their doors. But some will ask questions, and a handful might even agree to get shots on the spot.“We’re out here every single day,” said Aguirre, pausing to call out to an empty farm, checking for residents. “To gain trust of the Mennonites – because they’re reserved and closed-off people – you have to meet them where they’re at, show a friendly face.”

Aguirre’s work is part of an effort by health authorities across the country to contain, as cases climb not only here but