Sometimes, feeling better just requires stepping into the light. If you're up to date on wellness research, you know that light (and a lack thereof) has a huge impact on our body's internal clock, or circadian rhythm, and an impact on our health in turn. The more we learn about this interplay, the more we see that light is something we should not only be thinking about all day long; it's worth designing our homes around.
Purposeful light exposure is important all day long, not just in the morning or before bed.
First, some circadian basics: Every time we see light—the natural daylight of the sun, the warm hue of a light bulb—it either reinforces or disrupts our inner clock. "Light-dark patterns are the single most important cue for our clocks," explains Brant P. Hasler, Ph.D., a faculty member at the University of Pittsburgh Center for Sleep and Circadian Science. "Nothing else even approaches it."
Ideally, the schedule of your internal clock will sync up with your external clock and you'll be exposed to stimulating sun during the day and calming darkness at night. Of course, this isn't always possible—especially if you're working night shifts, studying long hours at school1, or traveling across time zones. "Circadian misalignment also occurs when an individual's chronotype is at odds with their environment, e.g., when someone who is an 'owl' and prefers to be active in the evening is forced to be at work early in the morning," adds Sofia Axelrod, Ph.D., a circadian clock researcher.
Misalignment between your light exposure and your body clock can have a negative impact on your sleep, blood sugar management, cardiovascular system, and even skin health. Well-timed light, on the other hand, has been shown to improve mood and overall life satisfaction (though it's not always clear whether these benefits are the result of the circadian system or a direct effect of the light itself).
In the last few years, Axelrod has seen this circadian research begin to impact our medical system. For starters, it's caused more sleep doctors to recommend keeping a dark bedroom in order to improve sleep quality—and reduce your risk of obesity, diabetes, and high blood pressure too. (One study published in PNAS found that just one night of moderate light exposure was enough to increase heart rate and next-morning insulin resistance compared to a night of dim light exposure in healthy adults.)
It's also caused people to be more selective about their cellphone use, at least in the hours before bed, since the artificial blue light from our phones is stimulating and can be detrimental to sleep.
More recently, the conversation around daytime light exposure has also picked up on social media. (Just look to the #circadian hashtag on TikTok—a compilation of videos of people getting out in the sunshine for the sake of their sleep and mood that has amassed 680.8K views.)
"Morning light is probably the most important for most people in order to keep their clocks on track," says Hasler, since the average time it takes our internal clocks to go through a full cycle is 24.2 hours (cycles can range from less than 24 hours to over 25 hours). This means that we need to essentially turn our clocks back by 12 minutes each day, which morning sun exposure can help with. Evening light works against this.
As licensed clinical psychologist Aric Prather, Ph.D., explained on his episode of the mindbodygreen podcast, it can also be beneficial to "bundle" your morning sun with other healthy practices like walking and having social interactions. However, Hasler caveats, "While morning light seems particularly important, it's not like the light the rest of the day is not important" since natural sun exposure throughout the day seems to have a positive impact on our sleep and mental alertness.
Clearly, optimum light is something we should always be striving for, but the demands of modern life don't make it easy. That's where making small adjustments in the place you do have control over—your home—can have a bright impact. "I see a huge untapped potential in the application of circadian rhythms research in our lives," says Axelrod.
Designing a circadian-friendly home.
Over the last few years, the role of the home has fundamentally changed. Once spaces of retreat and relaxation, in 2020, homes needed to become workspaces, gyms, and day cares overnight. In that process, we learned just how much a well-designed home could support us.
Looking forward to the future, we predict that people will pay more attention to not just optimizing their homes for different activities but different facets of health—starting with circadian health.
There is the rise in products that seek to block light out during the hours that you don't want it. "Everybody sleeps better in the dark," says Hannah Brennen, the co-founder of portable blackout curtain company Sleepout. When she launched the company on Kickstarter with her husband, Mark Coombs, last June, she didn't expect it to speak to so many people: The couple raised $295,000 in 35 days and has since gone on to secure over 18,000 customers—a combination of people who work at night, have restless young kids, or just understand the positive role that darkness has on sleep quality.
Dave Asprey, the founder of TrueDark blue-light-blocking glasses and TrueLight, a lighting line that mimics the colors found in nature, has seen circadian-rhythm-supporting products go mainstream as more people become aware that "our bodies respond to light and our sleep quality (and overall performance) depends on the type of light we are exposed to and when."
Brennan and Coombs from Sleepout predict that as public awareness on this topic continues to grow, the most popular products for sleep won't be the most luxurious pillows or the highest thread-count sheets. They'll be the tools that get down to our biological sleep needs.
Takeaway of the trend.
As more research comes out on the importance of a healthy circadian rhythm, we'll get better at supporting it during select points of the day, like with a morning walk or nighttime screen limit. As for the hours in between? That's where we can optimize our living spaces to light us up from the inside out.
Consider a DayLite Window to start making your home a circadian home!
Each window built by hand
Tunable from 3000k warm white to 6500k cool white to most closely replicate natural sunlight
70,000 hour typical life
Made from imported, cabinet grade New Zealand Pine
Can be installed On the wall, or IN the wall for remodels or new construction
Can be ordered painted, or unfinished
Can be controlled via phone app or smart home controls to set dimming, timers and dusk to dawn functions
Customizable to any size!
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