October 27, 2021

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The latest research by scientists. Greater access to daylight improves our circadian cycle

The International Journal of Environmental Research and Public Health writes that increased access to daylight in the home improves circadian rhythm, sleep, and mental health in healthy adults.

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The rhythm of day and night or dark light is essential to the body’s circadian and circadian clock and is the basis of many dimensions of health, including mental health. While the length of the day provides us with a relatively sufficient amount of light, our lifestyle has resulted in far fewer opportunities for exposure to light. Previous research has shown that Natural daylight can affect the quality of sleep at night.

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It has also been shown that indoor electrical lighting is usually dim, which may not be useful for the needs of a daytime regime. Lack of constant access to light and normal daily changes can lead to disturbances in performance, as well as poor sleep and health.

Given a natural experiment developed during the COVID-19 pandemic, Scientists traced the effects of light on 20 Reston residents in the United States. The subjects were observed for two weeks – first in their apartments, where they had electric windows that darkened automatically depending on the position of the sun, and the next week they had standard windows with rolling shutters at their disposal.

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Participants were equipped with sleep trackers and completed questionnaires about their health and well-being. Every half hour for five hours in the evening, they also provided saliva samples to measure levels of melatonin, a hormone that increases in the evening and makes you sleepy.



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Scientists found that it only took a week for the body’s production of melatonin to be delayed by 15 minutes when residents use blinds and self-regulate access to sunlight. This resulted in him falling asleep 22 minutes later and sleeping 16 minutes less each night. For comparison – during the week, when respondents were in apartments with electric windows, where they did not have to regulate the amount of light entering the house themselves, they showed greater vitality during the day, their anxiety decreased by 11%, and their stress was reduced by 9 percent.

“This is proof of that Daylight is the foundation of our health, even the hormonal economy.” – say the study authors.

The study authors suggest that this type of window could be one way to improve access to daylight. The use of this technology may improve the health of residents of large urban areas.

According to a study conducted by the Bureau of Labor Statistics (BSL) a research agency in the United States, in 2020, people spent 65 percent. The time I spent at home, whereas a year ago it was “only” 50 percent. This is a huge difference when it comes to accessing daylight and our proper functioning.

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