内容摘要：Cardinal Robert McElroy of San Diego speaks during a news conference, Feb. 27, 2025, in San Diego. (AP Photo/Gregory Bull, File)

Cardinal Robert McElroy of San Diego speaks during a news conference, Feb. 27, 2025, in San Diego. (AP Photo/Gregory Bull, File)

Darker mornings and more evening light together knock your body clock out of whack — which means daylight saving time can usher in sleep trouble for weeks or longer. Studies have even found an uptick in heart attacks and strokes right after the March time change.There are ways to ease the adjustment, including getting more sunshine to help reset your circadian rhythm for healthful sleep.

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.In Cuauhtemoc’s settlement, that’s leaders like Jacob Dyck Penner. As colony president, he and other leaders closed school for two weeks to slow infections, have made a push to show residents they’re working with health authorities, and are encouraging vaccination.

Leaders translate health information into Low German, the native language of most of the community. Penner and others are assisting vaccination teams, making sure families know how to access health services.“We had to find this way, together with doctors, to not pressure people or inspire distrust, so they can take their time and make their own decision to accept (being vaccinated),” Penner said.

Medics report more people visiting clinics, seeking vaccines for measles and other diseases. Still, Penner said, there a swath of people will always reject vaccinations.Health officials like Hernández say they’re concerned in particular for vulnerable populations including Indigenous groups, many of whom have fewer resources to cope.