How Smartphone Light Affects Your Brain and Body (Infographic)

The smartphone you use emits a bright blue light that allows you read what has been written on the screen even during the brightest points of the day. The light does not adjust according to the hour of the day and it is being emitted non-stop. This light is also emitted by laptops, TVs, and other devices, and the main issue here is that it mimics brightness of the sun, confuses your brain into thinking it is daytime, even during night and in that way your brain stops from releasing melatonin, the hormone which induces sleep, preventing you from falling asleep. For that reason, experts recommend to turn off the screens at least 2 hours before going to sleep.


A tiny organ in the brain named the pineal gland releases melatonin couple of hours before going to sleep. Malnopsin is called the photoreceptor which was discovered by the science that shows why the blue light emitted by screens keeps people awake. We have long been familiar with the cons and rods which construct vision, but Melanopsin was recently discovered in retinal ganglion cells that are sensitive to blue light. A research discovered that the average person that uses a mobile device before bedtime has difficulties fall and/or stay asleep.

The impact of this blue light is highly important for teens who are even more vulnerable to its effects due to the circadian rhythm naturally shifting during the adolescence. This causes the teens feel more awake ate into the night. To push sleepiness away can be triggered by starting a game or a TV show. This makes early mornings very difficult.

Blue light is not the only concern

There was a group of scientists from around the world joined by Dr. Martin Blank from the Department of Psychology and Cellular Biophysics at Colombia University and they are making an international appeal to the UN regarding the dangers that are connected to the different electromagnetic emitting devices such as cellphones and WiFi.

These devices are connected to cancer, but the most concerning thing is that the child’s brain absorbs up to four times as much radiation as the adult’s brain, thus children nowadays are growing with these devices in hand.

In China, the addiction to screens is considered a clinical disorder and has resulted in establishing rehab centers where there are young people who are addicted to screens and are being completely isolated from the media. The success needs to be established, however, the necessity paints a dark picture to the technological age in which we live.

What can be done?

First of all, you will need to limit your screen time before going to bed, and turn them off at least 2 hours before bedtime. You can catch up on your reading or download an application named f.lux to adjust the color of your screen to the day time (warm during night and brighter during day), cutting the blue light. There are other similar apps like this.

No matter if you are worried about your sleep, you can benefit from a daily break from the smartphones and other screens.