I have been studying research in the area of natural light and its interaction on the human brain. An important point to make is that appropriate exposure to natural light has positive effects on our circadian rhythm and in turn promotes many aspects of health.
We evolved from exposure to natural day lighting. The sun provides a specific wavelength (blue range) in the early morning that lasts until early afternoon. At that point a different light wavelength is produced (red to orange range). We recently discovered that the retina has a specific photoreceptor that detects light and sends it to a special part of the brain known as the suprachiasm, located near the hypothalamus. Once the suprachiasm is triggered, it sets off the hypothalamus, the master gland that in turn triggers the pituitary, thyroid, and adrenal glands of the brain and body. The hormonal reaction to light is what causes and promotes the diverse actions of the body and health.
The blue range of light helps our bodies become aroused, alert, attentive and focused. As the day proceeds and we enter the afternoon when the blue range of light shifts to the red/orange range our bodies begin the process of slowing and ultimately sleeping. Our body slows in blood pressure and we enter the four stages of sleep including deep sleep. Melatonin is produced and growth hormones are triggered.
The circadian rhythm (means approximately a day) is critically important to our health as it has effects on our immune system, ability to fight off disease, hunger and obesity, blood pressure, and cognition. It controls our sleep wake cycle so important for brain function and body regulation.
I have learned that there are design lighting systems that help to promote exposure to natural light, to help set the circadian rhythm, and to promote human performance in the workplace and school. Natural lighting via design lighting systems can also help older adults residing in assisted living or long-term care facilities. Older adults experience changes in their sleep wake cycles and this gets exacerbated with dementia and Alzheimer’s disease. Studies support increased school performance by students, and reduced agitation and increased sleep for older adults who reside or study in environments with the natural day lighting systems.
Email or call me if you work in a school district, an assisted living facility, or other building and have interest in enhancing human behavior and saving money from the energy efficiencies of natural day lighting systems.