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Most of America “sprang forward” for daylight saving time on March 8. Losing that hour of sleep can do more than leave you tired and cranky the next day. It could also harm your health.
Darker mornings and more evening light 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 began on March 8 at 2 a.m., an hour of sleep vanishing in most of the U.S. The ritual will reverse on Nov. 1 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 by going to bed a little earlier two or three nights ahead. While getting back on schedule after an hour’s change may not be that difficult for some people, it’s an added challenge for the third of U.S. adults who already don’t get the recommended seven hours of nightly shuteye.
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.
This article was provided by The Associated Press.