Daylight saving time ends in the US at 2 am local time on Sunday, giving residents an extra hour of sleep. Clocks should be set back an hour before going to bed. This change will last until March 9, when daylight saving time resumes.
Adjusting to the spring forward change can be harder on the body, with studies indicating an increase in heart attacks and strokes immediately after the change due to disruptions in the internal body clock. The fall back change is generally easier, but still requires some adjustment in sleep habits.
The transition to shorter days can be challenging for people with seasonal affective disorder, a type of depression linked to reduced sunlight in fall and winter. Health groups, such as the American Medical Association and the American Academy of Sleep Medicine, suggest eliminating time switches and maintaining standard time for better alignment with human biology.
Most countries do not observe daylight saving time, with variations in practice among those that do, primarily in Europe and North America. Arizona and Hawaii do not participate in the time change, staying on standard time year-round.
The brain's master clock, regulated by exposure to light and darkness, controls the circadian rhythm that influences sleep, heart rate, blood pressure, and metabolism. Disruptions caused by time changes can impact these bodily functions.
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