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Because 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. This shift in melatonin during puberty lasts into our 20s. 토토사이트

Adolescents also may be chronically sleep deprived due to school, sports and social activity schedules. For instance, many children start school around 8 a.M. Or earlier. This means that during daylight saving time, many young people get up and travel to school in pitch darkness.

This video takes a deeper dive – all the way back to 1895 – into the history of daylight saving time.

The 'western edge' effect

Geography can also make a difference in how daylight saving time affects people. 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.

This study found that western edge residents had higher rates of obesity, diabetes, heart disease and breast cancer, as well as lower per capita income and higher health care costs. Other research has found that rates of certain other cancers are higher on the western edge of a time zone.

Scientists believe that these health problems may result from a combination of chronic sleep deprivation and "circadian misalignment". Circadian misalignment refers to a mismatch in timing between our biological rhythms and the outside world. In other words, the timing of daily work, school or sleep routines is based on the clock, rather than on the sun's rise and set.

A brief history of daylight saving time

Congress instituted daylight saving time during World War I and again during World War II, and once again during the energy crisis of the early 1970s. The idea was that having extra light later into the afternoon would save energy by decreasing the need for electric lighting. 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.