Many are convinced that putting the phone for charging at night next to the bed is extremely unsafe for human health. We decided to check if such fears are justified.
Many media write about the dangers of telephone bedrooms, in particular "Russian newspaper"(" Name the harm from charging a smartphone during the night "), RIA "News" ("The doctor told why it is dangerous to sleep next to the smartphone") and "Mir24"(" A neurologist explained why it is harmful to sleep next to a mobile phone "). Usually base For this Council called emanating from the gadget radiation. "RBC-chipїOn " warns: “In those hours when we sleep, placing a cell phone next to us can lead to night horrors, insomnia, awakening at night. Electromagnetic radiation entails changes in the system of certain processes of self -regulation, such as biorhythms or heart rhythms. ” Users forums and sites with questions And answers Also regularly Interested, is it possible to sleep with the phone lying next to the pillow.
To begin with, it is worth stipulating that further it will be discussed exclusively about working phones with working chargers and batteries connected to a good network. Some breakdowns can really lead to the fact that the phone Exploding, however, the probability of the explosion will not affect in any way, a person sleeps at that moment, talks on the phone or listens to music. Also, sleep or wakefulness of a person will not affect the risk of breakdowns on the network - for example, the occurrence of a short circuit.
Modern chargers are wire and wireless. Wended chargers are connected to a standard outlet, a USB carrot or battery. In the first two cases they Get it A variable current and convert it to constant, transforming the current voltage from the usual 220V to 5V - this is the voltage, which is necessary to charge the smartphone. A phone dangerous for a person, including the charge, including on charging does not produce. In addition, the current always gives rise to a magnetic field - it does not matter, the phone, air humidifier or nightlight will be included in the outlet. On principle magnetic field also Work Wireless charging devices: alternating current from the outlet Creates The magnetic field in a wireless charging device, and thanks to an induction coil in a smartphone or other gadget, this magnetic field creates a direct current in it.
The alertness relative to the electromagnetic fields (EMP) has existed for a long time, although not all such fields are anthropogenic. For example, there are electromagnetic fields of the Earth (thanks to them, the compass arrow always points to the north) or electric fields that are formed in the air during a thunderstorm. To accumulate knowledge about the effect of EMP on the human body in 1996 Beginning Large multidisciplinary project. At the time of publication of the last report (in 2016), scientists from different countries published at least 25,000 scientific works on this topic. Experts even notice that now "scientific knowledge in this field is much wider than knowledge regarding most chemicals." At the same time, the WHO is unambiguous in its assessment: "The existing actual data does not indicate the existence of adverse consequences for health from the effects of EMP." Separately, experts note that such “blurry” health problems as headache, a sense of anxiety, suicidal moods and depression, nausea, a sense of fatigue and loss of libido, can only be associated with EMP - not electromagnetic fields cause these symptoms, but anxiety of the person himself associated with them. The organization also analyzed the effect of EMP on pregnancy: “The impact of fields ... does not increase the risk of spontaneous miscarriage, congenital malformations, low body weight at birth or congenital diseases.”
Thus, to be afraid of those electromagnetic fields that occur when charging gadgets, accurately Not worth it. Moreover, when using a wireless charger, these fields are extremely weak, which can be easily verified independently. It is enough to put the device not exactly on the charging itself, and next to it - even at a distance of literally one centimeter, the smartphone will not be charged, since initially the extremely weak electromagnetic field is additionally weakened with distance. That is, in order not to fall under its influence, it is enough not to put your head in a dream exactly on the charger itself and the phone on it.
Another fear concerns the heating of the phone during charging: the supposedly heated smartphone is able to critically increase the temperature of the brain of the person sleeping nearby. However, these thoughts are groundless. Firstly, brain cells Damaged At a temperature of more than 43 ° C - it is unlikely that a sleeping person will not wake up before from such a significant rise in temperature. Secondly, the smartphone is in principle incapable of such a radical heating. Iranian scientists decided To measure how many degrees the brain will heat up when the smartphone exposes it. For the study, samples of the brain of cows were taken, which for 15 minutes were placed by scientists at a distance of 4 mm from a working phone. None of the parts of the brain is heated even by 1 ° C. WHO Notesthat "at the frequencies used by mobile phones, most of the energy is absorbed by the skin and other surface tissues, which leads to a slight increase in temperature in the brain or any other organs of the body." Finally, we are still talking about a dream next to a loading phone, and not right on it on it, so there is no reason to worry about overheating of the brain.
However, it is better not to place the gadget right under the pillow. During charging, many devices heat up, and the pillow can enhance this effect. For example, Apple smartphones Not recommended Use at air temperatures above 35 ° C, since high temperatures reduce the battery capacity. The British charity organization Electrical Safety First, engaged in electrical safety problems, Turns Attention to the fact that bedding refers to flammable materials, therefore, the fire that began in bed will spread faster than the same fire on a solid surface, for example on a desk.
At the same time, a smartphone placed next to a sleeping person can still be uncomfortable. The on the smartphone’s screen is light, and the light, especially the blue range, Knocks down The production of melatonin is a hormone of sleep. Therefore, a dream next to a smartphone, whose screen is constantly light up from notifications, is still not the best idea. It is so that the notifications do not bother the sleeping person, the developers are usually Provide The function of the sleep mode, when the screen is activated, does not light up.
Thus, a working smartphone as a whole is safe to charge with a working charger even in the immediate vicinity of a sleeping person. At the same time, of course, it is better not to lie down directly on the charging and the phone, not to remove the loading phone under the pillow and do not forget to turn on the mode in which the screen will not light up from incoming notifications, interfering with its light to sleep.
Image on the cover: Wingalpha
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