Currently, most states enact Daylight Saving Time from March through November. From November, through March, states are on what’s called Standard Time.
Daylight Saving Time (DST) is a wartime invention that was designed to save electricity. Studied under modern-day conditions, DST has not been shown to save energy, and in fact may increase energy consumption.
Given these costs, many states are seeking to put an end to these twice-yearly clock shifts. However, some states want to make DST permanent instead of reverting to Standard Time year-round.
While year-round DST may sound like a nice idea, it would have negative effects on health. Permanent DST would lead to later sunrises in the winter, with many people starting their workday in darkness. This would create a stress on the circadian system, similar to what shift work does.
Later sunrises in the winter may also create a safety hazard for school children waiting for the bus in darkness. This is one reason why the Florida PTA was opposed to the year-round DST bill in Florida.
We can also learn from other countries experiments with permanent DST. Russia adopted permanent Daylight Saving Time in 2011. Immediately, there was a spike in morning road accidents, as well as other negative effects on health. The Russian parliament voted 442-1 to change course and adopt permanent Standard Time in 2014.