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Fortunately various applications are available that filter the problematic blue light on the spectrum and replace it with weak red light, thereby reducing the damage to the suppression of melatonin," concludes Prof. However, our study shows that it is not the screens themselves that damage our biological clock, and therefore our sleep, but the short-wave blue light that they emit. "Exposure to screens during the day in general, and at night in particular, is an integral part of our technologically advanced world and will only become more intense in the future. Accordingly, it is hardly surprising that the participants reported in the questionnaires that the felt more tired and in a worse mood after exposure to blue light. Whereas after exposure to red light (at both intensities) people woke up an average of 4.5 times (unnoticed awakenings), following exposure to weak blue light 6.7 awakenings were recorded, rising to as many as 7.6 awakenings following exposure to strong blue light. The most significant finding in terms of the disruption of sleep was that exposure to blue light drastically disrupts the continuity of sleep. "After exposure to red light, the body continued to behave naturally, but exposure to blue light led the body to maintain its normal temperature throughout the night - further evidence of damage to our natural biological clock." When the body returns to its normal temperature, we wake up," Prof. "Naturally, when the body moves into sleep it begins to reduce its temperature, reaching the lowest point at around 4:00 a.m. Thus, for example, it was found that exposure to blue light prevents the body from activating the natural mechanism that reduces body temperature. The researchers explain that the impaired production of melatonin reflects substantial disruption of the natural mechanisms and the body's biological clock. In addition, exposure to blue light significantly reduced the production of melatonin, whereas exposure to red light showed a very similar level of melatonin production to the normal situation.

On average, exposure to blue light reduced the duration of sleep by approximately 16 minutes. In the morning, the participants completed various questionnaires relating to their feelings. Following exposure to light, they were connected to instruments that measure brain waves and can determine the stages of sleep a person undergoes during the course of the night, including awakenings not noticed by the participants themselves. The participants were exposed to four types of light: high-intensity blue light, low-intensity blue light, high-intensity red light, and low-intensity red light. the hours when the pineal gland begins to produce and excrete melatonin.

In the second part of the trial, which took place at Assuta's Sleep Laboratory, the participants were exposed to computer screens from 9 p.m. They also completed a sleep diary and a questionnaire about their sleeping habits and quality of sleep. In the first part of the trial, the participants wore an actigraph for one week (an actigraph is a device that provides an objective measurement of the time when an individual falls asleep and wakes up). The study participants were 19 healthy subjects aged 20-29 who were not aware of the purpose of the study. The researchers sought to examine whether there is any difference in sleep patterns following exposure to blue screen light as compared to red light prior to sleep, and furthermore, to find which is more disruptive: wavelength or intensity? Yaron Dagan of the Research Institute for Applied Chronobiology at Tel Hai Academic College. Merav Cohen-Zion of the School of Behavioral Sciences at the Academic College of Tel Aviv-Yafo and Prof. Abraham Haim, head of the Israeli center for interdisciplinary research in chronobiology at the University of Haifa doctorate student Amit Shai Green of the Center for Interdisciplinary Chronobiological Research at the University of Haifa and the Sleep and Fatigue Center at Assuta Medical Center Dr. The new study, published in the journal Chronobiology International, was undertaken by researchers Prof. It has also been found that exposure to blue light with wave lengths of 450-500 nanometers suppresses the production of melatonin, a hormone secreted at night that is connected with normal body cycles and sleep. Previous studies have already shown that watching screens before going to sleep damages our sleep.