Daylight saving timing12/28/2023 ![]() Arizona and Hawaii are on permanent standard time, along with Puerto Rico, the U.S. The law allows states and territories to opt out of daylight saving time, however. In 2007, Congress amended the Uniform Time Act to expand daylight saving time from the second Sunday in March to the first Sunday in November, dates that remain in effect today. This law set the nationwide dates of daylight saving time from the last Sunday in April until the last Sunday in October. Because this created many railroad scheduling and safety problems, however, Congress passed the Uniform Time Act in 1966. While this has been proved true, the change is very small, and the health effects appear to outweigh the lower rates of crime.Īfter World War II, it was left to state governments to set the start and end dates for daylight saving time. This idea has since been proved largely inaccurate, as heating needs may increase in the morning in the winter, while air conditioning needs can also increase in the late afternoon in the summer.Īnother pro-daylight saving argument has been that crime rates drop with more light at the end of the day. The idea was that having extra light later into the afternoon would save energy by decreasing the need for electric lighting. One study showed that people living on the western edge of a time zone, who get light later in the morning and light later in the evening, got less sleep than their counterparts on the eastern edge of a time zone. ![]() Geography can also make a difference in how daylight saving time affects people. This means that during daylight saving time, many young people get up and travel to school in pitch darkness. For instance, many children start school around 8 am or earlier. This shift in melatonin during puberty lasts into our 20s.Īdolescents also may be chronically sleep deprived due to school, sports, and social activity schedules. This can interfere with sleep and cause us to sleep less overall, and the effect can last even after most people adjust to losing an hour of sleep at the start of daylight saving time.īecause puberty also causes melatonin to be released later at night, meaning that teenagers have a delay in the natural signal that helps them fall asleep, adolescents are particularly susceptible to sleep problems from the extended evening light of daylight saving time. In contrast, exposure to light later into the evening delays the brain's release of melatonin, the hormone that promotes drowsiness. This is particularly notable because morning light is valuable for helping to set the body's natural rhythms: It wakes us up and improves alertness.Īlthough the exact reasons are not yet known, this may be due to light's effects on increasing levels of cortisol, a hormone that modulates the stress response, or the effect of light on the amygdala, a part of the brain involved in emotions. So it's a permanent shift to later morning light for almost eight months – not just for the day of the change or a few weeks afterward. This is because our clock time is moved an hour later in other words, it feels like 7 am even though our clocks say it is 8 am. Springing forward is harder on the body, however. ![]() While some people may feel thrown off balance and need a few weeks to recover, research hasn't linked it to serious impacts on health. "Falling back" – going from daylight saving time to standard time each November by turning the clocks back one hour – is relatively benign.
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