There’s something unusual about September.
For many of us, nothing particularly dramatic happens. We haven’t moved house, started a new job or made a list of resolutions. Yet September can still bring a subtle feeling that it’s time to get back into a routine, reorganize something or simply start fresh.
Part of that feeling may come from years of associating September with new schedules and new beginnings. But there’s something else happening in the background too.
The environment around us is beginning to change, and our bodies are remarkably good at noticing.
September Has Been a “Fresh Start” for Longer Than You Think
For much of childhood and adolescence, the year doesn’t really begin in January. In many parts of the world, it begins when school starts.
New classes, new schedules, different routines and the end of the long summer break can make September one of the most distinctive transition points of the year.
Those associations don’t necessarily disappear once school is a distant memory. Research into what psychologists call the “fresh start effect” suggests that temporal landmarks, such as the beginning of a new week, month or year, can make people feel more motivated to pursue goals.
September comes with plenty of those cues. Even without consciously deciding to make a change, it can still feel like the beginning of a new chapter.
The World Around You Is Quietly Changing Too
The September shift isn’t entirely in our heads.
As the weeks pass, the length and timing of daylight begin to change. The difference from one day to the next is small enough that we rarely notice it happening.
But our bodies don't need us to consciously notice.
Light is one of the most important environmental signals the body receives. Specialized cells in the eyes detect light and send information to areas of the brain involved in regulating our internal clock.
In other words, while you may not be keeping track of sunrise and sunset, your body is receiving information about them every day.
Your Brain Uses Light to Tell Time
Our internal 24-hour clock helps coordinate patterns throughout the day, including when we naturally feel more alert and when the body begins preparing for sleep.
Light provides one of the strongest signals for keeping that clock aligned with the outside world.
Morning light, for example, helps signal that the active part of the day has begun. As evening approaches and light levels fall, the signals change.
That’s why light exposure is about much more than simply being able to see. The changing pattern of light across a day provides timing information that the brain can use without any conscious effort from us.
The Sunlight Your Brain Detects Isn’t the Same Sunlight Your Skin Uses
Here’s where things get interesting.
The light reaching your eyes and helping regulate your internal clock is not the same process involved in vitamin D production.
Vitamin D can be produced in the skin when it is exposed to sufficient UVB radiation from sunlight. And the amount of UVB that reaches us depends on much more than whether a day looks bright.
Season, latitude, time of day, cloud cover, clothing and time spent outdoors can all influence UV exposure. Ordinary window glass also blocks most UVB, so sitting in a sunny room isn't equivalent to being outside when it comes to vitamin D production.
A bright day, in other words, doesn't necessarily tell the whole story.
Our Routines Change Along With the Season
There’s another factor that has little to do with what the sun itself is doing: what we're doing.
A large portion of modern life happens indoors. We drive instead of walk, work under artificial lighting, exercise inside and can go from home to car to office and back again with surprisingly little time outdoors.
Small seasonal changes can influence those habits even further. A different work schedule, an earlier evening or simply falling back into a busier routine can change how much time we spend outside without it ever feeling like a deliberate decision.
That means our actual exposure to the outdoors may be quite different from what we assume based on the weather.
Vitamin D Is One Part of a Much Bigger Picture
Vitamin D plays several important roles in the body, including supporting normal immune function and helping maintain normal bones and muscle function.
But vitamin D status isn't something you can reliably determine from how you feel, how much time you think you spend outside or how sunny it has been lately.
For people who do choose to include vitamin D in their routine, there are different ways to do so.
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September may feel like a fresh start because we've spent years treating it like one. But there are also quieter changes happening around us: shifting daylight, changing schedules and subtle adjustments to the way we spend our days.
Sometimes a new season doesn't need to arrive with a dramatic change.
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