Experts warn that blue light from mobile phone screens and some home lighting steals sleep from the eye at night as it makes one alert and prevents sleepiness. According to the German news agency "dpa" and demanded to be removed from the bedroom or not to be exposed before in the hours when people prepare to sleep.
Professor Nicole Eter, director of the eye hospital at the University of Münster in Germany, explained that the red light helps one to sleep; as the body begins to produce sleep hormone "melatonin". There are special receptors of blue light in the retina, and these cells, known as ganglion cells, produce the protein "melanopsin".
"The blue light works to prevent melatonin production, so it prevents sleep." The resulting lack of sleep usually leads to impaired mood, concentration problems and reduced stamina, and in the long run the risk of cardiovascular disease, metabolism and depression is high.
There are several studies that have focused on blue light and sleep problems, but Strauss, director of experimental ophthalmology at Charité University Hospital, added: "From a purely scientific point of view, no one has been able to prove that the rhythm of sleep is disrupted by the screen light in the evening. "There are smaller studies with very contradictory results."
In 2018, Finnish researchers analyzed studies on the relationship between blue light and biological clock, and concluded that although melatonin production is limited, when one is exposed to blue light for two hours in the evening, this effect lasts for only 15 minutes. They concluded that red light can affect the biological clock as well.