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Light, darkness, human health and happiness

The various organs of the body work in perfect harmony to fulfill their full roles through work that is repeated throughout the twenty-four hours of the day. The biological clock’s work regulates the exposure of the body to light and darkness upon waking and sleeping. Specialized nerves send signals when light is located on the retina of the eye and connect it to the hypothalamus at the base of the brain, which is the center of regulation of the work of the biological clock and from which the pineal gland is activated and it is called “the third eye” is a small gland like a pine and located in the brain. Pineal by feeling light and dark.
It is known that the function of the pineal gland in the body in general is unclear and it works in harmony and balance with the hypothalamus or hypothalamus. What is also known is its production of the hormone melatonin, which is important in regulating sleep patterns, or what is known as the biological clock. The melatonin hormone produced by the body at night helps in distinguishing between morning times and evening times and plays an important role in regulating the rate of physical growth. When the body becomes less exposed to daylight, the pineal gland activates the production of the hormone Melatonin, and is released to the bloodstream at night. During the day, the body produces other hormones, such as serotonin, which are also stimulated by light. And many medical studies mention the relationship of exposure of the body to light during the day and darkness at night in the regularity of the secretion of many hormones in the body and their effectiveness after their secretion from the endocrine glands. In harmony with the action of hormones and the biological clock, and with natural exposure to light in the day and darkness at night, all the vital activities in the body are regulated, including the activation of the immune system, cells, glands, kidneys, liver, nervous system, fertility, fluctuations in blood pressure, heart rate, biochemical metabolism, growth process, and the repairs of cells and tissues that have been exposed For damage, memory, intellectual performance, happiness, and many other vital processes in the body as well as protecting people from exposure to serious diseases such as cancer.
So how should we if we are exposed to light day and night and not give an opportunity to the glands that activate and secrete their hormones in organizing these vital activities, especially after studies have shown that exposure to lighting at night by TV screens, computers and smart phones has a role in causing sleep disorders, insomnia and obstructing the work of the gland and its hormone?


Assistant Professor. Wijdan Dhaidan Shnain

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