Daylight saving time ends next weekend. This is how to prepare for the potential health effects

The end of daylight saving time means set your clock back an hour before bed, but some health experts say it’s time to do away with time switches.
The good news: You will get a glorious extra hour of sleep. The bad: It’ll be dark as a pocket by late afternoon for the next few months in the U.S.
Daylight saving time ends at 2 a.m. local time next Sunday, Nov. 3, which means you should set your clock back an hour before you go to bed. Standard time will last until March 9 when we will again “spring forward” with the return of daylight saving time.
That spring time change can be tougher on your body. Darker mornings and lighter evenings can knock your internal body clock out of whack, making it harder to fall asleep on time for weeks or longer. Studies have even found an uptick in heart attacks and strokes right after the March time change.
“Fall back” should be easier. But it still may take a while to adjust your sleep habits, not to mention the downsides of leaving work in the dark or trying to exercise while there’s still enough light. Some people with seasonal affective disorder, a type of depression usually linked to the shorter days and less sunlight of fall and winter, may struggle, too.
Some health groups, including the American Medical Association and American Academy of Sleep Medicine, have said it’s time to do away with time switches and that sticking with standard time aligns better with the sun — and human biology.
Most countries do not observe daylight saving time. For those that do — mostly in Europe and North America — the date that clocks are changed varies.
Two states — Arizona and Hawaii — don’t change and stay on standard time.
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Here’s what to know about the twice-yearly ritual.
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.
And that circadian clock affects more than sleep, also influencing things like heart rate, blood pressure, stress hormones and metabolism.
Even an hour change on the clock can throw off sleep schedules — because even though the clocks change, work and school start times stay the same.
That’s a problem because so many people are already sleep-deprived. About 1 in 3 U.S. adults sleep less than the recommended seven-plus hours nightly, and more than half of U.S. teens don’t get the recommended eight-plus hours on weeknights.
Sleep deprivation is linked to heart disease, cognitive decline, obesity and numerous other problems.
Some people try to prepare for a time change jolt by changing their bedtimes little by little in the days before the change. There are ways to ease the adjustment, including getting more sunshine to help reset your circadian rhythm for healthful sleep.
Lawmakers occasionally propose getting rid of the time change altogether. The most prominent recent attempt, a now-stalled bipartisan bill named the Sunshine Protection Act, proposes making daylight saving time permanent. Health experts say the lawmakers have it backward — standard time should be made permanent.
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