As people in the U.S. prepare to set their clocks ahead one hour on Sunday, March 10, 2024, 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.
Why our bodies are thrown off by DSTAmericans are split on whether they prefer permanent daylight saving time or permanent standard time. But a growing number of states are supporting permanent standard time. Adolescents also may be chronically sleep-deprived due to school, sports and social activities. For instance, many children start school around 8 a.m. or earlier, which means that during daylight saving time they get up and travel to school in pitch darkness.
The 'western edge' effectGeography 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 later in the evening, got less sleep than their counterparts on the eastern edge of a time zone.
The idea at that time 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.