12 Surprising Effects of Daylight Saving Time

ISTOCK.COM/TZAHIV
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
iStock.com/martin-dm

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.
iStock.com/PeopleImages

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
iStock.com/Drazen_

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.
iStock.com/CHRISsadowski

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
ISTOCK.COM/TZAHIV

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.
iStock.com/dannyfroese

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
iStock.com/hidesy

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.
iStock.com/quintanilla

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
iStock.com/Manuel-F-O

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
iStock.com/baloon111

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.

12 Quirky Books for Imaginative Kids

Simon & Schuster
Simon & Schuster

Though childhood classics like A.A. Milne's Winnie the Pooh and Maurice Sendak's Where the Wild Things Are never truly go out of style, each year brings a new cache of funny and fantastical books that will feed the expanding imaginations of young readers everywhere. From a self-conscious sewer monster who wants to make friends to a gluttonous dinosaur who gobbled up Christmas, this guide has the perfect quirky story for every kind of kid on your holiday gift list.

1. Rumple Buttercup // Matthew Gray Gubler ($9)

This whimsical tale about a self-conscious sewer monster is written and illustrated by Criminal Minds star, and king of quirk, Matthew Gray Gubler. While cute characters and a simple message about embracing your individuality make it a great gift for very young kids, its absurdist humor makes it a laugh-out-loud read for older kids and adults, too.

Buy it: Amazon

2. President Taft Is Stuck in the Bath // Mac Barnett ($8)

president taft is stuck in the bath
Candlewick/Amazon

Mac Barnett’s good-natured retelling of William Howard Taft’s infamous (though unconfirmed) bathtub blunder teaches children two things. One, history is far from a tedious list of names, dates, laws, and battles. And two, even the most stately world leaders have embarrassing moments.

Buy it: Amazon

3. It’s Only Stanley // Jon Agee ($15)

it's only stanley book
Dial Books/Amazon

When strange noises wake the Wimbledon family at night, they assume their dog Stanley is cleaning or fixing something; in reality, Stanley is transforming their house into a rocket ship that will carry them to an alien-inhabited planet. Fans of The Secret Life of Pets and Phineas and Ferb’s Perry the Platypus will love this rhyming read-aloud (and surely wonder what their own pet is up to when they’re not around).

Buy it: Amazon

4. Frankie Sparks and the Big Sled Challenge // Megan Frazer Blakemore ($6)

frankie sparks and the big sled challenge
Aladdin/Amazon

Third-grade inventor Frankie Sparks is back for the third book in her STEM-inspired series, and this time, she’s about to learn that the hardest part about creating a competition-winning sled is less about sled-building and more about team-building. Great for elementary school kids who love to create anything—be it art or architecture—as well as anyone who’s ever had to work on a group project.

Buy it: Amazon

5. The Pigeon HAS to Go to School! // Mo Willems ($10)

the pigeon has to go to school
Hyperion Books/Amazon

Mo Willems’s original pigeon book was Don’t Let the Pigeon Drive the Bus!, a thoroughly riotous, award-winning tale about a pigeon trying to convince readers to let it drive the bus when the bus driver asked them not to. In the latest story, the headstrong pigeon pivots to something it very much does not want to do—go to school. It sends a message about the value of doing things you don’t want to do, but, most importantly, it’s also really funny.

Buy it: Amazon

6. The Glass Town Game // Catherynne M. Valente ($11)

the glass town game
Simon & Schuster/Amazon

Catherynne M. Valente spins a riveting fictional tale from the true story of Charlotte, Emily, Anne, and Branwell Brontë’s childhood in a Yorkshire parsonage, where they passed the time dreaming up an intricate fantasy land populated with toy soldiers. In Valente’s novel, the fantasy land comes to life, complete with whale-sized flies, Champagne flutes that play music, and fire-breathing porcelain roosters, and the siblings must use all their wit and imagination to figure out how to get home. It’s a little like Alice in Wonderland meets The Chronicles of Narnia, and perfect for fans of both.

Buy it: Amazon

7. Lambslide // Ann Patchett ($13)

lambslide
HarperCollins/Amazon

The internationally bestselling author of Bel Canto and Commonwealth is just as clever when it comes to writing for kids. In Lambslide, a group of lambs mistakenly hear lambslide instead of landslide and begin a farm-wide campaign for an actual slide for lambs. With quaint illustrations, endearing characters, and an engaging plot, this is the type of book that ends up in the family for generations.

Buy it: Amazon

8. The Book With No Pictures // B.J. Novak ($9)

The Office alum B.J. Novak turns storytime into a full-fledged comedic performance with The Book With No Pictures, a book filled with nonsense words and phrases like blork and blaggity blaggity, which the reader has to read aloud. For parents, it’s a blueprint for embracing their silly side. For kids, it’s a chance to see their parents not seem so parental.

Buy it: Amazon

9. Spencer’s New Pet // Jessie Sima ($14)

spencer's new pet
Simon & Schuster/Amazon

The author of Not Quite Narwhal returns with another adorable story, this time about a boy who must avoid sharp objects in order to protect his balloon-animal pet dog. The mostly black-and-white illustrations (except for the dog, which is red) give Spencer’s New Pet a refreshingly old-fashioned feel, and the tale itself is sweet, evenly paced, and timeless.

Buy it: Amazon

10. Serafina and the Black Cloak // Robert Beatty ($8)

serafina and the black cloak
Disney-Hyperion/Amazon

When children begin disappearing from the Biltmore Estate, Serafina, who secretly lives in the basement, knows the culprit is a mysterious man in a black cloak who prowls the corridors at night. This novel has everything a quality middle-grade fantasy needs, including secret passageways, a forbidden forest, unknown magic, and a scrappy heroine. And the chills and thrills don’t stop at the end—it’s the first in a series of four (so far).

Buy it: Amazon

11. The Dinosaur That Pooped Christmas // Tom Fletcher and Dougie Poynter ($18)

the dinosaur that pooped christmas
Aladdin/Amazon

This jolly, strange story about a ravenous pet dinosaur who gobbles up all of Christmas is hilarious enough on its own—and perhaps even more so when you consider that it was written by British punk rockers Tom Fletcher and Dougie Poynter from the band McFly.

Buy it: Amazon

12. This Is a Taco! // Andrew Cangelose ($16)

this is a taco
Lion Forge/Amazon

A high-spirited, unique squirrel named Taco provides color commentary on regular squirrel facts in This Is a Taco!, a book that is much more than a factual guide to squirrels. In it, Taco embellishes, acts out, and sometimes completely changes the facts to be truer to his personal experience as a squirrel, which involves being opinionated and eating lots of tacos.

Buy it: Amazon

Mental Floss has affiliate relationships with certain retailers and may receive a small percentage of any sale. But we choose all products independently and only get commission on items you buy and don't return, so we're only happy if you're happy. Thanks for helping us pay the bills!

16 Biting Facts About Fright Night

William Ragsdale stars in Fright Night (1985).
William Ragsdale stars in Fright Night (1985).
Columbia Pictures

Charley Brewster is your typical teen: he’s got a doting mom, a girlfriend whom he loves, a wacky best friend … and an enigmatic vampire living next door.

For more than 30 years, Tom Holland’s critically acclaimed directorial debut has been a staple of Halloween movie marathons everywhere. To celebrate the season, we dug through the coffins of the horror classic in order to discover some things you might not have known about Fright Night.

1. Fright Night was based on "The Boy Who Cried Wolf."

Or, in this case, "The Boy Who Cried Vampire." “I started to kick around the idea about how hilarious it would be if a horror movie fan thought that a vampire was living next door to him,” Holland told TVStoreOnline of the film’s genesis. “I thought that would be an interesting take on the whole Boy Who Cried Wolf thing. It really tickled my funny bone. I thought it was a charming idea, but I really didn't have a story for it.”

2. Peter Vincent made Fright Night click.

It wasn’t until Holland conceived of the character of Peter Vincent, the late-night horror movie host played by Roddy McDowall, that he really found the story. While discussing the idea with a department head at Columbia Pictures, Holland realized what The Boy Who Cried Vampire would do: “Of course, he's gonna go to Vincent Price!” Which is when the screenplay clicked. “The minute I had Peter Vincent, I had the story,” Holland told Dread Central. “Charley Brewster was the engine, but Peter Vincent was the heart.”

3. Peter Vincent is named after two horror icons.

Peter Cushing and Vincent Price.

4. The Peter Vincent role was intended for Vincent Price.

Roddy McDowall in Fright Night (1985)
Roddy McDowall as Peter Vincent in Fright Night (1985).
Columbia Pictures

“Now the truth is that when I first went out with it, I was thinking of Vincent Price, but Vincent Price was not physically well at the time,” Holland said.

5. Roddy McDowall did not want to play the part like Vincent Price.

Once he was cast, Roddy McDowall made the decision that Peter Vincent was nothing like Vincent Price—specifically: he was a terrible actor. “My part is that of an old ham actor,” McDowall told Monster Land magazine in 1985. “I mean a dreadful actor. He had a moderate success in an isolated film here and there, but all very bad product. Basically, he played one character for eight or 10 films, for which he probably got paid next to nothing. Unlike stars of horror films who are very good actors and played lots of different roles, such as Peter Lorre and Vincent Price or Boris Karloff, this poor sonofabitch just played the same character all the time, which was awful.”

6. It took Holland just three weeks to write the Fright Night script.

And he had a helluva good time doing it, too. “I couldn’t stop writing,” Holland said in 2008, during a Fright Night reunion at Fright Fest. “I wrote it in about three weeks. And I was laughing the entire time, literally on the floor, kicking my feet in the air in hysterics. Because there’s something so intrinsically humorous in the basic concept. So it was always, along with the thrills and chills, something there that tickled your funny bone. It wasn’t broad comedy, but it’s a grin all the way through.”

7. Tom Holland directed Fright Night out of "self-defense."

By the time Fright Night came around, Holland was already a Hollywood veteran—just not as a director. He had spent the past two decades as an actor and writer and he told the crowd at Fright Fest that “this was the first film where I had sufficient credibility in Hollywood to be able to direct ... I had a film after Psycho 2 and before Fright Night called Scream For Help, which … I thought was so badly directed that [directing Fright Night] was self-defense. In self-defense, I wanted to protect the material, and that’s why I started directing with Fright Night."

8. Chris Sarandon had a number of reasons for not wanting to make Fright Night.

Chris Sarandon stars in 'Fright Night' (1985)
Chris Sarandon stars in Fright Night (1985).
Columbia Pictures

At the Fright Night reunion, Chris Sarandon recalled his initial reaction to being approached about playing vampire Jerry Dandrige. "I was living in New York and I got the script,” he explained. “My agent said that someone was interested in the possibility of my doing the movie, and I said to myself, ‘There’s no way I can do a horror movie. I can’t do a vampire movie. I can’t do a movie with a first-time director.’ Not a first-time screenwriter, but first-time director. And I sat down and read the script, and I remember very vividly sitting at my desk, looked over at my then wife and said, ‘This is amazing. I don’t know. I have to meet this guy.’ And so, I came out to L.A. And I met with Tom [Holland] and our producer. And we just hit it off, and that was it.”

9. Jerry Dandridge is part fruit bat.

After doing some research into the history of vampires and the legends surrounding them, Sarandon decided that Jerry had some fruit bat in him, which is why he’s often seen snacking on fruit in the film. When asked about the 2011 remake with Colin Farrell, Sarandon commented on how much he appreciated that that specific tradition continued. “In this one, it's an apple, but in the original, Jerry ate all kinds of fruit because it was just sort of something I discovered by searching it—that most bats are not blood-sucking, but they're fruit bats,” Sarandon told io9. “And I thought well maybe somewhere in Jerry's genealogy, there's fruit bat in him, so that's why I did it.”

10. William Ragsdale learned he had booked the part of Charley Brewster on Halloween.

William Ragsdale had only ever appeared in one film before Fright Night (in a bit part). He had recently been considered for the role of Rocky Dennis in Mask, which “didn’t work out,” Ragsdale recalled. “But a few months later, [casting director] Jackie Burch tells me, ‘There’s this movie I’m casting. You might be really right for it.’ So, I had this 1976 Toyota Celica and I drove that through the San Joaquin valley desert for four or five trips down for auditioning. And in the last one, Stephen [Geoffreys] was there, Amanda [Bearse] was there and that’s when it happened. I had read the script and at the time I had been doing Shakespeare and Greek drama, so I read this thing and thought, ‘Well, God, this looks like a lot of fun. There’s no … iambic pentameter, there’s no rhymes. You know? Where’s the catharsis? Where’s the tragedy?’ … I ended up getting a call on Halloween that they had decided to use me, and I was delighted.”

11. Not being Anthony Michael Hall worked in Stephen Geoffreys's favor.

In a weird way, it was by not being Anthony Michael Hall that Stephen Geoffreys was cast as Evil Ed. “I actually met Jackie Burch, the casting director, by mistake in New York months before this movie was cast and she remembered me,” Geoffreys shared at Fright Fest. “My agent sent me for an audition for Weird Science. And Anthony Michael Hall was with the same agent that I was with, and she sent me by mistake. And Jackie looked at me when I walked into the office and said, ‘You’re not Anthony Michael Hall!’ and I’m like ‘No!’ But anyway, I sat down and I talked to Jackie for a half hour and she remembered me from that interview and called my agent, and my agent sent me the script while I was with Amanda [Bearse] in Palm Springs doing Fraternity Vacation, and I read it. It was awesome. The writing was incredible.”

12. Evil Ed wanted to be Charley Brewster.

Stephen Geoffreys stars in 'Fright Night' (1985).
Stephen Geoffreys stars in Fright Night (1985).
Columbia Pictures

Geoffreys loved the script for Fright Night. “I just got this really awesome feeling about it,” he said. “I read it and thought I’ve got to do this. I called my agent and said ‘I would love to audition for the part of Charley Brewster!’ [And he said] ‘No, Steve, you’re wanted for the part of Evil Ed.’ And I went, ‘Are you kidding me? Why? I couldn’t… What do they see in me that they think I should be this?' Well anyway, it worked out. It was awesome and I had a great time.”

13. Fright Night's original ending was much different.

The film’s original ending saw Peter Vincent transform into a vampire—while hosting “Fright Night” in front of a live television audience.

14. A ghost from Ghostbusters made a cameo in Fright Night.

Visual effects producer Richard Edlund had recently finished up work on Ghostbusters when he and his team began work on Fright Night. And the movie gave them a great reason to recycle one of the library ghosts they had created for Ghostbusters—which was deemed too scary for Ivan Reitman's PG-rated classic—and use it as a vampire bat for Fright Night.

15. Fright Night's cast and crew took it upon themselves to record some DVD commentaries.

Because the earliest DVD versions of Fright Night contained no commentary tracks, in 2008 the cast and crew partnered with Icons of Fright to record a handful of downloadable “pirate” commentary tracks about the making of the film. The tracks ended up on a limited-edition 30th anniversary Blu-ray of the film, which sold out in hours.

16. Vincent Price loved Fright Night.


Columbia Pictures

Holland had the chance to meet Vincent Price one night at a dinner party at McDowall’s. And the actor was well aware that McDowall’s character was based on him. “I was a little bit embarrassed by it,” Holland admitted. “He said it was wonderful and he thought Roddy did a wonderful job. Thank God he didn’t ask why he wasn’t cast in it.”

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