At a Glance
  • Melatonin web searches on Google increased 36% from December 2021 to January 2022, as they have the past few winters.
  • Google searches for “sleep aid” also hit a five-year peak in January 2022.
  • West Virginia, Kentucky, and Mississippi are the states with the highest relative search volume for melatonin.

Melatonin’s popularity has grown tremendously in recent years. According to a February 2022 analysis of 18 years of National Health and Nutrition Examination Survey data , use of the supplement increased 170 bps among U.S. adults between 2000 and 2018. We’re also taking it in higher doses, the analysis says, with a September 2022 survey placing the average dose at 4.8 milligrams.

When do we want it? Apparently, as soon as the calendar changes.

Google searches for the term “melatonin” have jumped each of the past five winters, peaking each January. According to Google Trends, melatonin searches grew 36% from late December 2021 to early January 2022, spiking again at the end of January. 

Melatonin searches on Google
Google searches for melatonin hit an all-time high in January 2022, following a seasonal trend from the past five years, according to Google Trends.

So why are we so curious about melatonin in January? And what might it be telling us about how we sleep in the winter?

Wintry Mix: Sunlight Changes and Sleep

Clue No. 1 may lie in melatonin itself.

As a natural hormone that syncs our sleep-wake cycle to the light and dark parts of the day, melatonin helps set our circadian rhythms . Come late December, when winter solstice grants us the least amount of daylight we see all year, our melatonin triggers may get thrown off. 

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The lack of morning sunlight, thanks in part to the Northern Hemisphere tilting away from the sun during the winter, may shift the body’s sleep-wake cycle later in the day, explains Jeanne Duffy, Ph.D., a sleep-medicine scientist at Brigham and Women’s Hospital in Boston and associate professor of medicine at Harvard Medical School. 

Sarah Silverman, Psy.D., a behavioral sleep-medicine expert who treats patients in New York and Florida, adds that not getting enough natural sunlight, or “getting it at variable times throughout the week,” alters the timing of your body clock. And keeping that clock regulated is vital to good sleep. 

“Our internal circadian system, on average, is slightly longer than 24 hours,” Duffy says. “We have to reset our system a little bit each day.”

When that doesn’t happen, we can’t sleep. That’s a pattern Faith Skeen, 33, of Harlingen, Texas, started seeing as a teenager.

“I was looking at the stars when I should have been sleeping,” she says. “I found the constellation Orion and thought we were similar because we were both up every night in winter.”

According to Google Trends, “melatonin” searches grew 36% from late December 2021 to early January 2022.

Duffy co-authored a recent study that showed Google searches for the word “insomnia” increased by 58% during the first five months of 2020. The outset of the pandemic played a role, no doubt, with the time of year also contributing.

“I could imagine, in that situation, that people might be trying to use melatonin to try to fall asleep earlier,” she says.  

What Sleep Aids Are We Searching For? 

So what’s so special about melatonin, especially compared to other sleep aids?

For one, it’s an over-the-counter supplement that requires no prescription — just $5 or so for a bottle. It’s the most popular sleep aid on the market, with 27.4% of U.S. adults saying they use it regularly, according to a June 2022 survey.

But it might not be the only sleep-related term that has a moment in January. Melatonin’s search popularity in the early days of winter also mimics that of some other sleep topics. 

Google Trends indicates how many users searched for a specific term compared to all Google traffic in that time on a scale from zero to 100 . Searches for the term “melatonin” reached 99 or 100 on that scale four times in the past five years, in the weeks of Jan. 3, Jan. 24, and Jan. 21, 2021, as well as the week of Jan. 30, 2022.

Searches for the term “sleep aid” also reached their five-year peak the week of Jan. 30, 2022. The past few years, search volume for that term also increases in January and other winter months.

Similarly, although the phrase “how to fall asleep fast” has never exceeded single digits on Google’s search scale, it has increased consistently in late December each year, matching melatonin interest. In the past five years, searches for that phrase increased 69% to 200% in the final weeks of the year. 

Google searches for "how to fall asleep"
Google searches for “how to fall asleep” typically peak in January, according to Google Trends.

Among sleep aids themselves, interest for melatonin and Benadryl — a brand name for the antihistamine/sedative diphenhydramine — dominate search volume. The search term “Benadryl” sees a spike in the early summer, likely because of its use as an allergy medication.

Searches for “Unisom,” a brand name for the antihistamine doxylamine, also has had steady search interest in the past five years, with a 10% to 23% increase in the last week of December and the first week of January. But search volume for it, along with “valerian root” and “tranquilizer,” do not reach the peaks that melatonin does in the winter.

West Virginia, Kentucky Lead in Search Volume

The thing about winter: It’s not the same in all parts of the country. The same is true for melatonin-related search trends.

According to Google, the states with the highest relative search volume for “melatonin” in 2022 as of Dec. 27 were:

  • West Virginia
  • Kentucky
  • Mississippi
  • Tennessee
  • Arkansas
  • Alabama
  • Delaware
  • Ohio
  • Indiana
  • Michigan
  • Nebraska

Of those 11 states (Michigan and Nebraska tied for 10th-most volume), only Michigan and Ohio rank among the 11 states with the lowest amount of winter sunlight, according to the North America Land Data Assimilation System . So it may not necessarily be a matter of sleepers replacing sunlight with a supplement.

West Virginia and Kentucky, however, have the second- and third-highest percentages of adult residents getting less than the recommended seven hours of sleep each night, among all states, according to the 2022 County Health Rankings & Roadmaps report . Like the rest of the East, both also experience their coldest temperatures of the year in January, along with Mississippi, Tennessee, Arkansas, and Alabama.

West Virginia, Mississippi, and Arkansas also comprised the top three states (albeit in different order) for melatonin search volume in winter 2021/2022 and in summer 2022. 

Melatonin will not only potentially help you fall asleep more easily, but it will also help to shift your internal clock earlier.”
Jeanne Duffy
Sleep-Medicine Scientist

What’s more, general Google web searches for melatonin don’t necessarily equate to melatonin purchases, either. Business Insider and others have cited Nielsen data calling out a 42.6% year-over-year increase in melatonin sales between 2019 and 2020, with other reports citing consistent growth month to month.

NOW Foods, which sells branded melatonin in various forms, says it saw no trend of increased melatonin sales in January 2021 or 2022, says Alana Horinko, NOW Foods senior public relations manager. 

“Melatonin is, in general, a popular product,” she says.

Of all sleep aids, it also may be the most likely to help with winter sleep issues, Duffy says. Which may be the root of the trend.

“Melatonin not only affects sleep, but it also has what we call chronobiological effects,” she says. When used along with improved sleep hygiene, “it will not only potentially help you fall asleep more easily, but it will also help to shift your internal clock earlier.”

10 Sources

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  3. Deanna Hence, How the Earth’s tilt creates short, cold January days (January 10, 2022). The Conversation., Retrieved Dec. 6, 2022, from
  4. Lewy, A. J., Lefler, B. J., Emens, J. S., & Bauer, V. K. (2006). The circadian basis of winter depression. Proceedings of the National Academy of Sciences of the United States of America, 103(19), 7414–7419., Retrieved Dec. 12, 2022, from
  5. Zitting, K. M., Lammers-van der Holst, H. M., Yuan, R. K., Wang, W., Quan, S. F., & Duffy, J. F. (2021). Google Trends reveals increases in internet searches for insomnia during the 2019 coronavirus disease (COVID-19) global pandemic. Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine, 17(2), 177–184., Retrieved Dec. 15, 2022, from
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  7. North America Land Data Assimilation System (NLDAS) Daily Sunlight (insolation) for years 1979-2011 on CDC WONDER Online Database, released 2013., Retrieved Nov. 23, 2022, from
  8. 2022 County Health Rankings National Findings Report. (2022). County Health Rankings & Roadmaps., Retrieved Dec. 27, 2022, from
  9. National Centers for Environmental Information. (n.d.). U.S climate normals., Retrieved Dec. 27, 2022, from
  10. Allana Akhtar, Americans have turned to melatonin to soothe pandemic-induced stress. Experts worry high demand, little federal oversight, and insufficient data leave the industry ripe for scams (Jan. 17, 2021). Business Insider., Retrieved Dec. 6, 2022, from

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