Daylight saving time ends at 2 a. That's when local time will instantly become 1 a. The change also brings a downfall, since many people with traditional 9-to-5 office jobs will no longer see much daylight outside the office on weekdays until next spring. Here are 9 things to know about daylight saving time:. It's daylight saving time not saving's or savings time. It's singular, no matter how people around you say the phrase. Since , daylight saving time begins on the second Sunday of March and ends on the first Sunday of November.
Previously, it had started on the last Sunday of April and ended on the last Sunday of October. It was not started to help America's farmers out.
According to timeanddate. Hawaii, certain areas of Arizona, and the U. Virgin Islands do not practice DST. For the start of DST, we set our clocks forward one hour at 2 a.
Then, at 2 a. Adjusting the time by one hour may not seem like too drastic a change, but sleep experts have noted troubling trends that occur during the transition between Standard Time and DST, particularly in March. These issues include upticks in heart problems, mood disorders, and motor vehicle collisions. Furthermore, DST can cause sleep problems if circadian rhythms are not aligned with natural cycles of light and darkness.
Some people also experience insomnia symptoms due to spring time changes. Humans and other mammals are guided by circadian rhythms, which are hour cycles that regulate sleep and other key bodily functions such as appetite and mood. These rhythms are largely dependent on light exposure. In order to reset each day, they must be synchronized with natural light-darkness cycles in order to ensure healthy, high-quality sleep. In addition to sleep loss, people are at greater risk of mood disturbance, suicide, and being involved in traffic accidents during both bi-annual transition periods.
However, experts suggest that long term, there is a reduction of accidents as more people drive home from work in daylight. In fact, gaining an extra hour of sleep often leaves people feeling more refreshed following the end of DST. However, people may experience some moderate effects such as difficulty adjusting to a new wake-up time.
While many people adapt to time changes, some studies have suggested the human body never fully acclimates to DST. Rather, their circadian misalignment may become a chronic or permanent condition.
Social jet lag has been linked to a higher risk of obesity, depression, and cardiovascular disease. The effects of DST subside gradually after a few weeks.
The beginning of DST in March is associated with many negative outcomes and risk factors that some experts advocate for abandoning the system altogether in favor of a year-round time. They argue a permanent standard time is more in line with human circadian rhythms, and that this schedule would carry benefits for public health and safety. On the side of the argument, people in favor of DST argue that at least 70 countries around the world observe DST as it decreases energy consumption, reduces costs, and protects the environment.
Historically, there were no uniform rules for DST from to This caused widespread confusion, especially in transport and broadcasting. Following the oil embargo, the US Congress extended the DST period to 10 months in and 8 months in , in an effort to save energy. From to , the country observed DST for about 7 months each year.
Most people were at home and this was the time when the fewest trains were running. It is late enough to minimally affect bars and restaurants, and it prevents the day from switching to yesterday, which would be confusing.
It is early enough that the entire continental U. For the U. The Navajo Nation participates in the Daylight Saving Time policy, even in Arizona, due to its large size and location in three states. Many fire departments encourage people to change the batteries in their smoke detectors when they change their clocks because Daylight Saving Time provides a convenient reminder. More than 90 percent of homes in the United States have smoke detectors, but one-third are estimated to have dead or missing batteries.
See more information about elsewhere in the world. Spring forward, Fall back During DST, clocks are turned forward an hour, effectively moving an hour of daylight from the morning to the evening.
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