12 Surprising Effects of Daylight Saving Time

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ISTOCK.COM/TZAHIV

Every March, clocks "spring forward" across much of the United States, robbing people of one precious hour of sleep. (In 2019, Daylight Saving Time will occur March 10.) While hearing those same people complain about being tired is one not-so-surprising effect of Daylight Saving Time, the possibility of a longer prison sentence for those going before a judge on "sleepy Monday" is less expected. Here are 12 surprising effects of Daylight Saving Time—the good, the bad, and the scientifically ambiguous.

1. Increased Spending

Woman whips out her credit card while hanging out on a hammock
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In 2016, JP Morgan Chase decided to look into the economic consequences of Daylight Saving Time (DST) by examining Los Angeles and Phoenix, two cities that are large, relatively close to each other, and have stable weather. Critically, Phoenix doesn't observe DST while Los Angeles does [PDF].

Among their findings, DST was "associated with a 0.9 percent increase in daily card spending per capita in Los Angeles at the beginning of DST." Perhaps more surprising, the end of DST was associated with a per capita daily spending reduction of 3.9 percent.

2. A Higher Risk of Heart Attacks

An image of a man grabbing his chest.
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Many studies have shown that DST is associated with an increase in heart attacks, with one study showing a 24 percent increase in the number of heart attacks on the Monday after DST at a group of Michigan hospitals. According to the University of Michigan, Mondays are bad for heart attacks in general (researchers believes the stress of beginning a new workweek and changes to the sleep-wake cycle are the reason why), but DST makes everything worse. Interestingly, the Tuesday following the end of DST was associated with a 21 percent drop in patients.

3. Missed Appointments

Young man runs to catch a missed train
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Somewhat relatedly, a 2017 study found that the percentage of missed medical appointments increased significantly following DST. But as with heart attack risk, the missed appointments decreased in the fall—at least temporarily.

4. More Car Accidents … Maybe (at Least for a Few Days)

An image of a car with a broken headline after being in an accident.
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Another field where studies aren't as consistent as one might expect is traffic accidents. In 2001, an American study found that there was a significant increase in accidents on the Monday after the shift to DST. A 2018 New Zealand study echoed the sentiment, finding that on the first day of DST road accidents increased 16 percent. In contrast, a Swedish study found that DST didn't have any important effect in that country.

Of course, there's more to DST than just those first couple days. After DST has gotten started, there's more light on the road later in the day. Several studies have found this light reduces accidents substantially, so much so that one study concluded that a year-round DST would reduce motor vehicle occupant fatalities by 195 per year.

It's so complicated that a 2010 analysis in Minnesota listed 10 studies that found positive effects of DST on road safety, and six studies that showed negative effects in both the spring and fall changes.

5. Longer Prison Sentences

A photo of a judge handing out a sentence with a clock sitting next to her
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Researchers frequently use DST to study sleep deprivation in populations, as it's a period of time when we all wake up an hour before we’re used to. One of these studies focused specifically on judicial punishment in U.S. federal courts. The researchers looked at "sleepy Monday" (the Monday after the time change) and compared the sentence lengths to other Mondays. They found that on "sleepy Monday," judges handed out 5 percent longer sentences. But don't think you can get a lighter sentence during the fall switch; the researchers found no effect on sentencing at that time. But the researchers point out that this probably isn't limited to judges—even managers may find themselves in the mood for doling out harsher punishments.

6. More Mining Injuries

An image of mining helmets on a shelf.
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According to one study of mining injuries from 1983 to 2006, the Monday directly after the switch to DST was associated with 5.7 percent more workplace injuries and 68 percent more workdays lost because of injuries, indicating that there are more injuries that are more severe after the switch [PDF]. There isn't, however, a corresponding decrease in the fall.

7. Fewer Koala Collisions

A street sign warns of koala bears
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One study decided to look at how DST affected human-wildlife interaction, specifically koala-vehicle collisions [PDF]. Because koalas are largely nocturnal, they often cross the road in the evening or at night. By shifting traffic patterns to times when it wasn't dark, the researchers found that DST could "decrease collisions with koalas by 8 percent on weekdays and 11 percent at weekends" (although the difference between weekend and weekdays wasn't significant, the researchers proposed that a slight increase in morning collisions lessened the benefit during the weekday). The researchers hope that further study can be done on human-animal interactions and DST.

Koalas aren't the only ones crossing a road that benefit from DST; pedestrians might be safer as well. One study found "no significant detrimental effect on automobile crashes in the short run" and in the long run was associated with "a 8 to 11 percent fall in crashes involving pedestrians … in the weeks after the spring shift to DST." Meanwhile, another study found that a year-long DST would mean 171 fewer pedestrian fatalities a year.

8. Decreased Satisfaction With Life in General (and Increased Use of the Word Tired)

A woman sitting in front of a computer looking tired.
istock.com/PeopleImages

In both the UK and Germany, studies have shown that life satisfaction deteriorates in the first week after the switch to DST in the spring. One study even quantified the deterioration in Germany with money. For the entire sample, the cost was calculated to be €213 (about $262), but for people in full employment—with relatively inflexible schedules—that increases to €332 ($408). And for the men in the sample, the cost of transition was €396 ($487).

Meanwhile, a Facebook analysis looked at the "feelings" people were sharing on the platform. On the Monday after the start of DST, the use of the word tired increased by 25 percent, with similar increases for "sleepy" and "exhausted" (as well as "wonderful" and "great"). In just the period from 5 a.m. to 12 p.m. on Monday, "feeling tired" usage increased an average of 86 percent, from a 12 percent increase in the non-DST Arizona up to a 231 percent increase in Delaware. By Thursday, "tired" is back to normal.

9. Sleepier Kids (Maybe)

A little girl sleeping with her mouth open.
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The studies surrounding DST and school children are surprisingly inconclusive. On the one side, a 2009 article in Sleep Medicine looked at 469 Germans from 10 to 20 years old and divided them up into 'larks' (those who go to bed early and wake up early) and 'owls' (those who go to bed late and wake up late). They found that after the DST transition the group was sleepier for three weeks after the transition, with owls showing higher daytime sleepiness, and proposed that tests shouldn't take place in the week following the switch over to DST.

A 2017 article in Economics of Education Review, however, looked at 22,000 Europeans students and found that, at least for low-stakes tests, the effect wasn't statistically significant.

10. More Cyberloafing on the Job

A woman gets caught cyberloafing at work
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Another study looked at people's Google search trends for the Mondays before the switch to DST, immediately after the switch, and a week after, with a specific focus on sites like Facebook, YouTube, and ESPN (i.e. entertainment sites that people probably aren't Googling for their jobs). They found that on the Monday after the switch, people searched for 3.1 percent more entertainment websites than the Monday before DST, and 6.4 percent more than the subsequent Monday. While the researchers caution they can't be sure this was all "cyberloafing," the fact that there was nothing else special about these Mondays meant it very likely was.

11. Mistimed Insulin Shots

A woman injecting herself with an insulin pen.
iStock.com/6okean

It might seem that in this age of smartphones and connected devices that figure it all out, the twice-yearly ritual of finding all the clocks to change is a thing of the past. But that's not necessarily true. In a 2014 article in the Journal of Diabetes Science and Technology, the authors pointed out an easy clock to miss: insulin pumps. Because most commercial pumps aren't GPS-enabled and lack internal time change mechanisms, they have to be manually set up. The study authors discuss an international college student with an insulin pump that came from a country that didn't observe DST, meaning the clock was an hour off. They say that no significant harm resulted, but it just serves as a reminder to make sure you check all your clocks.

12. Higher Energy Bills

Man reviews an energy bill on a tablet app
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One of the main rallying cries for DST is that it saves energy, but studies have been mixed. In 1975 the Department of Transportation issued a report about whether a short-lived, year-long DST experiment had been worthwhile [PDF]. They declared "modest overall benefits might be realized by a shift from the historic six-month DST system," but cautioned that these benefits were difficult to isolate. Optimistically, though, they said DST might help reduce 1 percent of electricity use.

But as modern researchers have noted, electricity usage has shifted since then. Chief among the changes: Only 46 percent of the new single family households completed in 1975 had air conditioning, compared to 93 percent in 2016 [PDF].

Indiana provided a good place to test this change, because in 2006 they decided to observe DST as an entire state (individual counties had observed DST before). A study ultimately concluded that while DST does save electricity in lighting, this is more than offset by increased demands for heating and cooling, resulting in Indiana households being hit by $9 million per year in higher electricity bills [PDF]. However, the study only looked at residential electricity consumption, not commercial or industrial.

Around the same time, the Department of Energy also looked into DST and found that during a four-week extension, electricity use decreased about half a percentage point per day. Ultimately, Stanton Hadley at the Oak Ridge National Laboratory told Live Science, "I could see the answer being either way."

This story originally ran in 2018.

11 Memorable Facts About Cats the Musical

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Mike Clarke/Getty Images

“It was better than Cats!” Decades after Andrew Lloyd Webber's famed musical opened on Broadway on October 7, 1982, this tongue-in-cheek idiom remains a part of our lexicon (thanks to Saturday Night Live). Although the feline extravaganza divided the critics, it won over audiences of all ages and became an industry juggernaut—one that single-handedly generated more than $3 billion for New York City's economy—and that was before it made a return to the Great White Way in 2016. In honor of Andrew Lloyd Webber's birthday on March 22, let’s take a trip down memory lane.

1. The work that Cats the musical is based on was originally going to include dogs.

Old Possum’s Book of Practical Cats, published in 1939, is a collection of feline-themed poems written by the great T. S. Eliot. A whimsical, lighthearted effort, the volume has been delighting cat fanciers for generations—and it could have become just as big of a hit with dog lovers, too. At first, Eliot envisioned the book as an assemblage of canine- and tabby-related poems. However, he came to believe that “dogs don’t seem to lend themselves to verse quite so well, collectively, as cats.” (Spoken like a true ailurophile.) According to his publisher, Eliot decided that “it would be improper to wrap [felines] up with dogs” and barely even mentioned them in the finished product.

For his part, Andrew Lloyd Webber has described his attitude towards cats as “quite neutral.” Still, the composer felt that Eliot’s rhymes could form the basis of a daring, West End-worthy soundtrack. It seemed like an irresistible challenge. “I wanted to set that exciting verse to music,” he explained. “When I [had] written with lyricists in the past … the lyrics have been written to the music. So I was intrigued to see whether I could write a complete piece the other way ‘round.”

2. "Memory" was inspired by a poem that T.S. Eliot never finished.

In 1980, Webber approached T.S. Eliot’s widow, Valerie, to ask for her blessing on the project. She not only said “yes,” but provided the songwriter with some helpful notes and letters that her husband had written about Old Possum’s Book of Practical Cats—including a half-finished, eight-line poem called “Grizabella, the Glamour Cat.” Feeling that it was too melancholy for children, Eliot decided to omit the piece from Practical Cats. But the dramatic power of the poem made it irresistible for Webber and Trevor Nunn, the show’s original director. By combining lines from “Grizabella, the Glamour Cat” with those of another Eliot poem, “Rhapsody on a Windy Night,” they laid the foundation for what became the powerful ballad “Memory.” A smash hit within a smash hit, this showstopper has been covered by such icons as Barbra Streisand and Barry Manilow.

3. Dame Judi Dench left the cast of Cats when her Achilles tendon snapped.

One of Britain’s most esteemed actresses, Dench was brought in to play Grizabella for Cats’s original run on the West End. Then, about three weeks into rehearsals, she was going through a scene with co-star Wayne Sleep (Mr. Mistoffelees) when disaster struck. “She went, ‘You kicked me!’” Sleep recalls in the above video. “And I said, ‘I didn’t, actually, are you alright?’” She wasn’t. Somehow, Dench had managed to tear her Achilles tendon. As a last-minute replacement, Elaine Paige of Evita fame was brought aboard. In an eerie coincidence, Paige had heard a recorded version of “Memory” on a local radio station less than 24 hours before she was asked to play Grizabella. Also, an actual black cat had crossed her path that day. Spooky.

4. To finance the show, Andrew Lloyd Webber ended up mortgaging his house.

Although Andrew Lloyd Webber had previously won great acclaim as one of the creative minds behind Jesus Christ Superstar and other hit shows, Cats had a hard time finding investors. According to choreographer Gillian Lynne, “[it] was very, very difficult to finance because everyone said ‘A show about cats? You must be raving mad.’” In fact, the musical fell so far short of its fundraising goals that Webber ended up taking out a second mortgage on his home to help get Cats the musical off the ground.

5. When Cats the musical came to Broadway, its venue got a huge makeover.

Cats made its West End debut on May 11, 1981. Seventeen months later, a Broadway production of the musical launched what was to become an 18-year run at the Winter Garden Theatre. But before the show could open, some major adjustments had to be made to the venue. Cats came with an enormous, sprawling set which was far too large for the theatre’s available performing space. To make some more room, the stage had to be expanded. Consequently, several rows of orchestra seats were removed, along with the Winter Garden’s proscenium arch. And that was just the beginning. For Grizabella’s climactic ascent into the Heaviside Layer on a giant, levitating tire, the crew installed a hydraulic lift in the orchestra pit and carved a massive hole through the auditorium ceiling. Finally, the theater’s walls were painted black to set the proper mood. After Cats closed in 2000, the original look of the Winter Garden was painstakingly restored—at a cost of $8 million.

6. Cats the musical set longevity records on both sides of the Atlantic.

The original London production took its final bow on May 11, 2002, exactly 21 years after the show had opened—which, at the time, made Cats the longest-running musical in the West End’s history. (It would lose that title to Les Miserables in 2006.) Across the pond, the show was performed at the Winter Garden for the 6138th time on June 19, 1997, putting Cats ahead of A Chorus Line as the longest-running show on Broadway. To celebrate, a massive outdoor celebration was held between 50th and 51st streets, complete with a laser light show and an exclusive after-party for Cats alums.

7. One theatergoer sued the show for $6 million.

Like Hair, Cats involves a lot of performer-audience interaction. See it live, and you might just spot a leotard-clad actor licking himself near your seat before the curtain goes up. In some productions, the character Rum Tum Tugger even rushes out into the crowd and finds an unsuspecting patron to dance with. At a Broadway performance on January 30, 1996, Tugger was played by stage veteran David Hibbard. That night, he singled out one Evelyn Amato as his would-be dance partner. Mildly put, she did not appreciate his antics. Alleging that Hibbard had gyrated his pelvis in her face, Amato sued the musical and its creative team for $6 million.

8. Thanks to Cats the musical, T.S. Eliot received a posthumous Tony.

Because most of the songs in Cats are almost verbatim recitations of Eliot’s poems, he’s regarded as its primary lyricist—even though he died in 1965, long before the show was conceived. Still, Eliot’s contributions earned him a 1983 Tony for Best Book of a Musical. A visibly moved Valerie Eliot took the stage to accept this prize on her late spouse’s behalf. “Tonight’s honor would have given my husband particular pleasure because he loved the theatre,” she told the crowd. Eliot also shared the Best Original Score Tony with Andrew Lloyd Webber.

9. The original Broadway production used more than 3000 pounds of yak hair.

Major productions of Cats use meticulously crafted yak hair wigs, which currently cost around $2300 apiece and can take 40 hours or more to produce. Adding to the expense is the fact that costumers can’t just recycle an old wig after some performer gets recast. “Each wig is made specifically for the actor,” explains wigmaker Hannah McGregor in the above video. Since people tend to have differently shaped heads, precise measurements are taken of every cast member’s skull before he or she is fitted with a new head of hair. “[Their wigs] have to fit them perfectly,” McGregor adds, “because of the amount of jumping and skipping they do as cats.” Perhaps it should come as no surprise that, over its 18-year run, the first Broadway production used 3247 pounds of yak hair. (In comparison, the heaviest actual yaks only weigh around 2200 pounds.)

10. A recent revival included hip hop.

In December 2014, Cats returned to the West End with an all-new cast and music. “The Rum Tum Tugger,” a popular Act I song, was reimagined as a hip hop number. “I’ve come to the conclusion, having read [Old Possum’s Book of Practical Cats] again, that maybe Eliot was the inventor of rap,” Webber told the press.

11. Another revival featured an internet-famous feline for one night only.

On September 30, Grumpy Cat made her Broadway debut in Cats, briefly taking the stage with the cast. Despite being named Honorary Jellicle Cat, she hated every minute of it.

11 Words That Started Out As Spelling Mistakes

A woman sneezing, which in Middle English would have been called a fneze instead.
A woman sneezing, which in Middle English would have been called a fneze instead.
iStock.com/Dirima

The word irregardless might not be to everyone’s taste, but there’s no denying that if you were to use it in a sentence, you’d be perfectly understood—and that’s more than enough evidence for it to have been accepted into many dictionaries (albeit flagged as non-standard or informal), including Oxford Dictionaries, Merriam-Webster, and even the hallowed Oxford English Dictionary, which has so far been able to trace it back as far as 1912. So despite it having its origins in an error, and irregardless of what you might think of it, there’s no denying irregardless is indeed a word—and it’s by no means alone.

1. Expediate

Meaning “to hasten” or “to complete something promptly,” the verb expediate is thought to have been invented by accident in the early 1600s when the adjective form of expedite, meaning “ready for action” or “alert,” was misspelled in an essay by the English politician Sir Edwin Sandys (it was later corrected).

2. Culprit

There are several different accounts of the origin of culprit, but all of them seem to agree that the word was born out of a mistake. Back when French was still the language of the law in England in the Middle Ages (a hangover from the days of the Norman Conquest), the phrase Culpable, prest d’averrer nostre bille—literally “guilty, ready to prove our case”—was apparently the stock reply given by the Clerk of the Crown whenever a defendant gave a plea of not guilty. In the court records, this fairly long-winded phrase was often abbreviated just to cul. prit., and, as the Oxford English Dictionary explains, “by a fortuitous or ignorant running together of the two,” the word culprit was born.

3. Despatch

Despatch is a chiefly British English variant of dispatch, often used only in formal contexts like the name of the political despatch box in the House of Commons. The e spelling apparently began as a phonetic variation of the original I spelling, but after Samuel Johnson included it in his Dictionary of the English Language in 1755, its use was legitimized and thrived in the 19th century. Because Johnson himself preferred the I spelling in his own writings, however, it's supposed that he included the e spelling by mistake and inadvertently popularized the error.

4. Nickname

Nicknames were originally called eke names, with the verb eke used here in the sense of “to make longer” or “to provide an addition.” Sometime in the 13th century, however, “an eke-name” was mistakenly interpreted as “a neke-name,” and the N permanently jumped across from the indefinite article an to the verb eke. The same error—known linguistically as “rebracketing” or “junctural metanalysis”—is responsible for nadders, numpires, and naprons all losing their initial Ns in the Middle English period.

5. Ammunition

Ammunition derives from a faulty division of the French la munition, which was incorrectly misheard as l'amonition by French soldiers in the Middle Ages, and it was this mistaken form that was borrowed into English in the 1600s.

6. Scandinavia

Scandinavia was originally called Scadinavia, without the first N, and is thought to take its name from an island, perhaps now part of the Swedish mainland, called Scadia. According to the Oxford English Dictionary, the extra N was added in error by the Roman scholar Pliny the Elder, and has remained in place ever since.

7. Syllabus

If all had gone to plan in the history of the word syllabus, those two Ls should really be Ts: Syllabus was coined as a Latin misreading of an Ancient Greek word, sittybos, meaning “a table of contents.”

8. Sneeze

Oddly, sneeze was spelled with an F and not an S, fneze, in Middle English, which gives weight to the theory that it was probably originally coined onomatopoeically. At least one explanation of why the letter changed suggests that this F inadvertently became an S sometime in the 15th century due to continual misreadings of the long lowercase f as the old-fashioned long S character, ſ.

9. Ptarmigan

The ptarmigan is a bird of the grouse family, found in mountainous and high-latitude environments. Its bizarre name with its initial silent P is something of a mystery, as the original Scots word from which it derives, tarmachan, shows no evidence of it and there’s little reason why one should ever have to have been added to it—except, of course, if it were a mistake. The P spelling first emerged in the late 1600s, and is thought to have been a mistaken or misguided attempt to ally the name to the Greek word for a wing, pteron, and eventually this unusual P spelling replaced the original one.

10. Sherry

Sherry takes its name from the southern Spanish port of Xeres (now Jerez de la Frontera in Cádiz) and was originally known as vino de Xeres, or “wine of Xeres.” This name then morphed into sherris when sherry first began to be talked about in English in the early 17th century, but because of that final S, it didn’t take long for that to be misinterpreted as a plural. Ultimately, a mistaken singular form, sherry, emerged entirely by mistake in the early 1600s.

11. Pea

Another word that developed from a plural-that-actually-wasn’t is pea. One pea was known as a pease in Middle English, but because of that final “s” sound, pease was quickly misinterpreted as a plural, giving rise to a misguided singular form, pea, in the 17th century. The actual plural of pease in Middle English, incidentally, was pesen.

This list first ran in 2016.

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