Turning on the light to sleep is a bad habit, and its pathological essence is the horror of darkness. Most of this fear of the dark began in childhood, because when I was a child, I often heard stories about ghosts and gods. The background, content and characters of such stories often appear at night or in the dark, which is invisible to ordinary people, to show their vividness and mystery. Over time, people’s fear of monsters and ghosts was linked with the darkness, forming their dependence on lights, which led to them not daring to turn off the lights to sleep. This is a main reason for turning on the lights to sleep.
Medical experts have found through research that turning on the light while sleeping will inhibit the secretion of melatonin in the human body and reduce the immune function of the human body. When people go to sleep at night, the brain will secrete melatonin, which is most strongly secreted from 11:00 am to the early morning of the next day and will stop after daybreak. The secretion of melatonin can inhibit the excitability of human sympathetic nerves, reduce blood pressure, slow down the heartbeat, rest the heart, enhance the immunity of the body, eliminate fatigue, and even kill cancer cells.
When you turn on the light to sleep, the secretion of melatonin will be inhibited, which will not only affect the quality of sleep, but also affect the immunity of the human body, and even lead to cancer. There is a little-known endocrine organ in the human brain called the pineal gland. Scientific research has confirmed that one of the functions of the pineal gland is to secrete a large amount of melatonin at night when the human body enters sleep.
The secretion of melatonin can inhibit the excitability of human sympathetic nerves, reduce blood pressure, slow down the heart rate, make the heart breathe, strengthen the immune function of the body, restore fatigue, and even kill cancer cells. However, one of the biggest characteristics of the pineal gland is that as soon as the eye sees the light source, melatonin will be stopped by the inhibition gate.
We know that the eyelids of people have the effect of partially covering the light source. If you wear an eye mask to sleep, your eyes will not touch the light at night. Even if you turn on the light to sleep, it will not affect the secretion of melatonin. However, once the light is turned on and the night starts frequently, the secretion of melatonin will be more or less suppressed, which will indirectly affect the immune function of the human body.
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