Morning Light: The Simple Habit That Helps Set Our Biological Clock

The first light of the day is easy to underestimate. It feels soft — cool air, the day barely begun — but to the body it is not soft at all; it is the starting signal.

A few minutes of it can change how we feel for hours, and its role goes much deeper than a good feeling: morning light is one of the main ways the body sets its hormones for the day ahead.

It helps set our biological clock, which affects our hours of sleep and wakefulness, our energy levels, our alertness, and the timing of various hormonal processes in the body.

We are used to thinking of hormones as something that operates independently, but in fact, many of them change over the course of the day according to a natural rhythm.

And light is one of the most important signals that help the body maintain this rhythm.

Our biological clock begins in the eyes

Deep in the brain is a small area called the suprachiasmatic nucleus, or by its scientific name, Suprachiasmatic Nucleus.

This is the central clock of the body, whose role is to synchronize various biological processes with the day-night cycle.

This clock receives information about light and darkness through the eyes.

When we are exposed to natural light in the morning, the brain receives a signal that the day has begun.

That signal helps time our hours of wakefulness, the secretion of melatonin, and the activity of additional systems in the body.

Daylight outside is usually much stronger than the lighting we receive indoors, even when it is cloudy.

Therefore a short trip outside in the morning can be a simple way to help the body distinguish between day and night.

Cortisol is not only a stress hormone

When we hear the word cortisol, most of us immediately think of stress.

But cortisol also has essential roles in the body, and it participates in regulating metabolism, the immune response, and alertness.

In many people, cortisol levels rise around waking and reach relatively high levels in the morning hours.

This process is part of the natural rhythm of the body.

Morning light can affect the biological clock system and the timing of cortisol activity, but the exact effect varies from person to person.

The goal is not to raise cortisol as much as possible, but to maintain a proper rhythm that suits our hours of wakefulness and sleep.

What is the connection between morning light and better sleep?

One of the important roles of morning light is to help regulate the secretion of melatonin.

Melatonin is a hormone that signals the body that the time has come to prepare for sleep.

Its secretion usually rises in the evening hours, when the surroundings darken, and decreases when we are exposed to light.

Exposure to natural light in the morning hours helps set the biological clock, and thus may support a more suitable timing of the feeling of tiredness in the evening.

Therefore, if we want to improve our sleep, the morning deserves as much attention as the evening before bed.

Bright mornings and evenings with more moderate lighting can help the body maintain the natural distinction between day and night.

Morning light and mood

Light also has an effect on systems in the brain connected to alertness and mood.

Exposure to bright light is even used as part of certain treatments for seasonal mood disorders, although the treatment is done through defined protocols and not necessarily through a short outing into the sun.

There are studies that point to a connection between exposure to daylight and better mood, alertness, and higher-quality sleep.

But it is important to understand that morning light is not a treatment for every emotional or hormonal problem.

It is simply one of the environmental factors that help the brain and the body function according to the day-night cycle.

Does morning light also affect metabolism?

The biological clock does not stop at sleep.

It is connected also to the timing of metabolic processes, including the regulation of sugar levels, the feeling of hunger, and the response of the body to meals.

In many people there are differences over the course of the day in insulin sensitivity and in the ability to deal with meals.

Therefore, maintaining regular hours of sleep and wakefulness and suitable exposure to light may support the proper function of the metabolic system.

At the same time, this does not mean that a quarter of an hour of morning light balances all the hormones or treats hormonal disorders.

The main effect is on the timing of the biological clock, which participates in regulating many systems of the body.

And what about vitamin D?

Here, two different mechanisms are at work.

The effect of morning light on the biological clock occurs mainly through the eyes.

In contrast, vitamin D production occurs in the skin following exposure to UVB radiation.

In the early morning hours, the intensity of UVB radiation may be too low to allow significant production of vitamin D, depending on the season, geographic location, and additional conditions.

Therefore there is no need to expose the skin to unprotected sun radiation to enjoy the benefits of morning light.

And if there is a concern about vitamin D deficiency, it is worth consulting a doctor about suitable tests and supplements, and not relying on unprotected exposure to the sun.

And what about our skin?

Daylight can contribute to a feeling of alertness and a healthy lifestyle, but exposure to UV radiation is not without risk.

Sun radiation contributes to premature aging of the skin, the appearance of pigmentation spots, and an increased risk of skin cancer.

Therefore I always recommend combining enjoyment of being outside with suitable protection from the sun.

You can enjoy morning light also when using sunscreen, wearing a hat, or being in a bright shaded area.

The biological clock needs the light that reaches the eyes, not a tanning of the skin.

How can morning light be incorporated into the routine?

I love simple habits that do not require special effort.

One of them is going outside for a short time in the morning hours, preferably relatively close to waking.

You can start with ten to twenty minutes in daylight, according to the weather and the schedule of the day.

This is not a fixed medical dose, and on cloudy days or for people with significant disruption of the biological clock, a different approach may be needed.

The light exposure can be combined with a short walk, drinking coffee in the garden, or sitting outside.

There is no need to look directly at the sun, and certainly no need to remove sunglasses if they are needed for safety or comfort. Daylight can contribute to setting the biological clock even without direct exposure to the sun.

It is also important to use sun protection according to the exposure conditions, and not to wait until after being outside to apply sunscreen.

The small habits that make the difference

I believe that not everything good we do for our health has to be complicated or expensive.

Sometimes it is precisely the simplest habits.

Going out into the open air in the morning, moving the body, drinking water, eating well, and keeping regular hours of sleep.

These are not magic solutions, but they can support each other and help us build a healthier lifestyle.

At OrOrgani we believe that skincare is part of a broader approach to health and quality of life.

Alongside quality skincare products, we encourage habits that contribute to feeling good and to the health of the body.

Natural light, physical activity, good sleep, and protection from the sun are part of this approach.

Because for me, true care does not begin only in front of the mirror.

It begins with the way we choose to live.

Light in the morning, darkness at night — the body was built for that rhythm long before we had lamps and phones. All we do is stop fighting it.

With love,
Nurit Rozenblat
OrOrgani

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