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from the gotta-wake-up-and-smell-the-collective-coffee dept.
Morning light helps keep our internal clocks on track. Daylight saving time throws that off:
Daylight saving time has ended, and most Americans have turned their clocks back an hour. My sixth-grader is in heaven.
At 6:50 a.m. these days, our once testy tween zombie is now ... moderately awake and relatively lucid.
Instead of rising to gauzy predawn light, she's got glowy morning sunshine beaming around her curtains. When she sets off for school, the sun has been up nearly a full hour. Just a 60-minute change has lightened both the morning and her mood. At breakfast today, I think I even spied a smile.
On November 6, every state in the United States except Hawaii and most of Arizona switched from daylight saving time, or DST, to standard time (those two states don't observe DST). That switch shifted an hour of light from the evening to the morning. In March, we'll move in the other direction when we "spring forward," trading morning light for brighter evenings.
The United States' biannual time change has been lighting up headlines since the U.S. Senate's unanimous vote in March to make daylight saving time permanent. The Sunshine Protection Act would forgo turning clocks to and fro, repeating an unpopular experiment Congress tried in the 1970s and prioritizing evening light throughout the year. But the health case for staying on daylight saving time is pretty dim. And what such a shift could mean for adolescents is especially gloomy.
Even the name "daylight saving time" isn't quite right, says Kenneth Wright, a sleep and circadian expert at the University of Colorado Boulder. There's no change in the amount of daylight, he says. "What we're doing is changing how we live relative to the sun." When we move our clocks forward an hour, noon no longer represents when the sun is near its highest point in the sky. Suddenly, people's schedules are solarly out of sync.
That's a big deal biologically, Wright says. Humans evolved with a daily cycle of light and dark. That sets the rhythms of our bodies, from when we sleep and wake to when hormones are released. Morning light, in particular, is a key wake-up signal. When we tinker with time, he says, "we're essentially making the choice: Do we want to go with what we've evolved with, or do we want to alter that?"
From a health perspective, if he had to rank permanent daylight saving time, permanent standard time or our current practice of biannual clock changing, Wright says, "I think the answer is incredibly clear." Permanent standard time is healthiest for humans, he says. In his view, permanent daylight saving time ranks last.
(Score: 2) by Mykl on Sunday November 20 2022, @08:49PM (2 children)
This rationale (more daylight at the end of the day) has always annoyed me. Given that we have less daylight hours in winter, surely it would make more sense to apply Daylight Savings then in order to make more use of those meagre hours in the afternoon/evening? What happens instead in summer is that we get a 'double dose' of shifting time to get an extra hour as well as having more sunlight in the first place. Doesn't add up.
What Daylight Saving _does_ do that makes sense is placing sunrise around the same general time throughout the year. As the days get longer, sunrise is shifted so that it occurs around about the same clock hour that it does in winter. This helps our circadian rhythms, which have evolved to work around dawn (much as dairy farmers do regardless of what the clock says).
(Score: 3, Touché) by ChrisMaple on Monday November 21 2022, @05:19AM (1 child)
In the northern contiguous U.S., sunrise and sunset each shift by at least 4 hours from solstice to solstice. No one-hour shift can make up for that.
(Score: 2) by Mykl on Monday November 21 2022, @06:24AM
To be pedantic, it's _up to_ 4 hours depending on your latitude, but point taken. Daylight Saving mitigates the (up to) 4 hour shift without completely eliminating it.