As people in the US prepare to turn their clocks ahead one hour in mid-March, I find myself bracing for the annual ritual of media stories about the disruptions to daily routines caused by switching from standard time to 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 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.
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 arefrom the extended evening light of daylight saving time. This shift in melatonin during puberty lasts into our 20s. Adolescents also may be chronically sleep deprived due to school, sports, and social activity schedules. For instance, many
or earlier. This means that during daylight saving time, many young people get up and travel to school in pitch darkness.Geography can also make a difference in how daylight saving time affects people.
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