--- title: Daylight Saving Time Triggers My Seasonal Affective Disorder description: Seasonal Affective Disorder (SAD) doesn't only strike in the winter, when days are short. Too much sunlight can lead to depression, too. canonical: https://time.com/6261465/daylight-saving-time-seasonal-affective-disorder/ author: Jeffrey Kluger article:opinion: false article:content_tier: free article:published_time: 2023-03-10T14:03:16.000Z article:modified_time: 2026-02-24T15:33:15.444Z article:section: Health og:title: Daylight Saving Time Means Sunnier Days Ahead. That Depresses Me og:description: Seasonal Affective Disorder (SAD) doesn't only strike in the winter, when days are short. Too much sunlight can lead to depression, too og:url: https://time.com/6261465/daylight-saving-time-seasonal-affective-disorder/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt4c2d49253a284596/698a3aff09208f4def41a271/S.A.D.gif?branch=production&width=3840&quality=75&auto=webp&crop=16:9 og:image:width: 1200 og:image:height: 675 og:image:alt: S.A.D og:type: article twitter:card: summary_large_image twitter:title: Daylight Saving Time Means Sunnier Days Ahead. That Depresses Me twitter:description: Seasonal Affective Disorder (SAD) doesn't only strike in the winter, when days are short. Too much sunlight can lead to depression, too twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt4c2d49253a284596/698a3aff09208f4def41a271/S.A.D.gif?branch=production&width=3840&quality=75&auto=webp&crop=16:9 --- # Daylight Saving Time Means Sunnier Days Ahead. That Depresses Me ## Video: Daylight Saving Time: Here's What Losing An Hour of Sleep Really Does to Your Body [Watch (HLS stream): Daylight Saving Time: Here's What Losing An Hour of Sleep Really Does to Your Body](https://cdn.jwplayer.com/manifests/Sq5cPO5f.m3u8) (1:57)  _Published 2018-03-09. The start of Daylight Saving Time, when the clocks spring forward by an hour, is among the most hated days of the year_ Mar 10, 2023 2:03 PM CUT  Illustration by Katie Kalupson for TIME  by [Jeffrey Kluger](/author/jeffrey-kluger/)  ## Jeffrey Kluger Editor at Large Mar 10, 2023 2:03 PM CUT I know, I know—you couldn’t be more delighted that spring and summer are on the way. The toasty days, the warm nights, the gentle breezes and, especially, the lengthening hours of daylight, which begin Mar. 12 with the return of Daylight Saving Time. To which I say: Keep it; keep it all: the heat, the humidity, the hot wind masquerading as a warm breeze. And especially keep all that confounded light. Give me a cloudy sky, a light drizzle, and a 4:30 PM sundown, and I couldn’t be happier. There’s a whole school of study around the phenomenon of Seasonal Affective Disorder (SAD), the experience of low- and sometimes high-grade depression that strikes [about 5%](https://www.psychiatry.org/patients-families/seasonal-affective-disorder "undefined") of Americans during the winter months, when days are short and sunlight is scarce. But there’s a smaller, less well-studied group—of which I am a lifetime member—that experiences just the opposite: a summer SAD, also known as reverse SAD, that emerges just as the skies are brightening, the weather is warming, and the days are lengthening. Call us dyspeptics or cranks, but don’t call us crazy, because reverse SAD is at last getting the study it deserves, and more and more researchers are considering it a real and diagnosable condition. “Some people may be intolerant of the heat, some people may be intolerant of too much light,” says Dr. Norman Rosenthal, clinical professor of psychiatry at Georgetown University and the researcher who coined the term “seasonal affective disorder” in a 1984 [paper](https://pubmed.ncbi.nlm.nih.gov/6581756/ "undefined") published in the _Archives of General Psychiatry_. The reason for summer SAD—which Rosenthal estimates affects about 1% of the U.S. adult population—is not certain, but the condition itself is. “One possibility is that there may simply be an abnormality in circadian rhythms that kicks off summer SAD. At the moment, we just don’t have good data on the neurochemistry of the condition.” If there is a dearth of research on summer SAD sufferers, there is a wealth when it comes to their wintertime counterparts. For one thing, says Rosenthal, as days get shorter, there is a [reduction in levels of the neurotransmitter serotonin](https://time.com/4888327/why-sunlight-is-so-good-for-you/ "undefined") in the brain’s hypothalamus, the brain region that [regulates](https://my.clevelandclinic.org/health/articles/22566-hypothalamus "undefined") mood, sex drive, hunger, sleep, body temperature, and more. Dial down the serotonin, and a whole range of systems can start to come undone. “There have been studies with drugs that hit a certain serotonin receptor and elicit abnormal responses in winter SAD patients,” says Rosenthal. When those same people are treated with light therapy—essentially bathing in light [in the blue-band spectrum](https://pubmed.ncbi.nlm.nih.gov/19016463/ "undefined")—the effect of the drug normalizes. “Some of these people may just be sub-sensitive to natural light,” Rosenthal adds, and need a boost from an artificial source. **Read More**: [_The Daily Habits of Happiness Experts_](https://time.com/6241099/daily-habits-happiness-experts/ "undefined") Kelly Rohan, a professor of psychological science at the University of Vermont, reports on a [study](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2647333/ "undefined") in which she was involved that found a possible genetic root in wintertime SAD. Working with a sample group of 220 people—130 of whom were winter SAD sufferers—she and her colleagues found an irregularity in a gene that governs [melanopsin](https://pubmed.ncbi.nlm.nih.gov/32173405/#:~:text=Melanopsin%2C%20a%20G%20family%20coupled,rhythms%2C%20cognitive%20and%20affective%20processes. "undefined"), a receptor in the retina that influences circadian rhythms, hormone secretions, and cognitive processes, among other things. The irregularity, she stresses, was found in only seven of the SAD sufferers, but the fact that it was there at all suggests that genes may play a role in at least some cases of the condition. “It’s not going to explain a lot of the variance in terms of who might suffer,” she says, “but there might be something in terms of the melanopsin gene as one example.” Evolution, too, may play a role. Humans adapted to the dominant light levels in the part of the world they inhabit, and when the days shorten—especially as the extremely brief days surrounding the winter solstice approach—it disrupts the regular balance of mood and bodily functions our systems maintain. Things only get worse in the parts of the world, like the U.S., that set clocks back an hour in the fall, lopping an extra hour of sunlight out of the day. “We evolved in certain conditions,” says Rosenthal. “We maintain a certain homeostasis \[that can be disrupted\] by radical changes in the environment.” But where does this leave the 1% of us who flip the calendar and experience the same internal disruption as light levels increase and the weather brightens? For starters, many scientists believe the key variable may not be too many hours of daylight, but too much heat and humidity during those hours. The neurochemicals dopamine, serotonin, and norepinephrine, which all help shape mood, also play a role in the body’s thermoregulation. Throw too much heat at that system, and brain chemistry can go awry. “It’s possible that people with summer SAD have some abnormalities in some of those key neurotransmitters,” says Rohan. Melatonin levels may be in play too. A naturally occurring hormone that helps regulate sleep, melatonin is overproduced when light levels are high, says Carolyn Moriarty, a licensed clinical professional counselor at the Chicago Counseling Center. “This can disrupt the sleep-wake cycle,” she explains, and that, in turn, can affect mood. **Read More:** [_Why Not Everyone Needs 8 Hours of Sleep_](https://time.com/5876614/circadian-rhythm-study/ "undefined") One other improbable player in the summer SAD might be pollen. Even in people who don’t suffer severe [seasonal allergies](https://time.com/6223485/seasonal-allergies-treatments/ "undefined"), pollen can trigger an inflammatory reaction, which can affect norepinephrine levels. “The inflammatory response crosses the blood-brain barrier and contributes to negative mood states,” says Rohan. Finally, there may be a host of other factors that have less to do with the body and more to do with the other variables related to summer, says Rohan. People who work seasonally, like teachers, might become depressed—or at least disoriented—as summer approaches and the structure that defines the rest of the year vanishes. Parents face extra childcare burdens when their children are out of school and may also confront financial challenges like paying for summer camp or family vacations. Body image issues can surface as well, as people shed long pants and long sleeves for shorts and bathing suits. Then, too, there is FOMO—or the fear of missing out—as people who love summer post photos of their Memorial Day cookouts and their Fourth of July fireworks parties, and the summer SADders feel like summer losers. Before diagnosing a clinical case of summer SAD, says Rohan, “it’s really important to rule out the stressors that may be causing a depression.” For those whose summer sadness is not caused by any of those factors, there are a handful of palliatives. Rosenthal recommends wraparound sunglasses for outdoors and blackout shades in the home as two ways to keep exposure to light levels down. Moriarty suggests spending as much time as possible in air-conditioned spaces—with a bonus if that space is also dark, like a movie theater. And for summer SAD that reaches the level of clinical depression, psychotherapy and psychotropic medications might help as well. I, for one, will try the glasses and the blackout shades, and I never mind slipping into the cool, dark embrace of a movie theater on a hot August afternoon. But mostly, I’ll just play the waiting game. If long spring and summer days are a seasonal certainty, so too are short fall and winter ones. Enjoy the coming of the light, all you summer lovers, and I’ll meet you on the flip side, when the Earth completes its next half cycle around the sun and the seasons blessedly change again. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/6261465/daylight-saving-time-seasonal-affective-disorder/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/6261465/daylight-saving-time-seasonal-affective-disorder/"},"headline":"Daylight Saving Time Means Sunnier Days Ahead. 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