Health Effects of Blue Light on Children: Does Blue Light Cause Sleep Issues in Children? Update 05/2024

Most children’s lives are now dominated by electronic devices. When it comes to academics, entertainment, and communication, kids rely heavily on screen-based devices. Despite the numerous educational and social advantages provided by modern technology, the ease with which we can now get our hands on these gadgets has its drawbacks as well. There is a concern about how technology affects sleep.

Children’s sleep quality has declined as a result of the widespread use of technology in daily life. Over half of teenagers and one-third of children do not get adequate sleep. There are a number of ways that electronic gadgets could alter the amount of sleep that children get at night. The more time we spend in front of devices at night, the less time we have to sleep, therefore having engaging content could help us sleep better. The blue light emitted by electronic devices is another means through which they may interfere with your sleep.

What Is Blue Light?

The visible light spectrum is made up of a wide range of wavelengths. The wavelengths of violet and red light are the smallest and the longest, respectively. When it comes to promoting attentiveness and performance, blue light has a short wavelength. When it comes to regulating our circadian rhythm, blue light is the most significant.

The Truth About Blue Light, Sleep, and Your Kids | Fatherly

What Are Common Sources of Blue Light?

TVs, tablets, PCs and some e-readers all have screens that emit blue light artificially. As it turns out, we’re not only exposed to blue light from electronic devices. The sun is the primary source of our blue light exposure. In addition, LED and fluorescent light bulbs, which have become increasingly widespread in homes due to their energy efficiency, generate blue light. This light is harmful to the eyes and can lead to eye damage.

Blue Light and Melatonin

melatonin is a hormone that induces slumber, and blue light reduces melatonin production The rising and lowering of the sun helped humans develop a sleep-wake cycle that is based on the seasons. Melatonin levels are low throughout the day, rise in the evening after sunset, peak in the middle of the night, and gradually decline until the morning when we are solely exposed to natural light from the sun.

During the day, blue light from the sun or other sources can boost energy and focus. Studies have indicated that exposing yourself to blue light during the day can help you get a better night’s rest. As a result, our natural sleep-wake cycle is disrupted when we use devices that emit artificial blue light in the evening and at night. As a result, when it’s time to go to bed, we’re less rested than we should be.

Health Effects of Blue Light on Children

A growing body of evidence shows that our children’s health is being harmed by their exposure to artificial blue light on a daily basis.

Taking a closer look at their health, let’s take a look at the following five areas:


Continuous blue light exposure, especially in the evening, confuses the brain and throws our internal clock off.

As the daylight dims in the evening, the brain secretes melatonin, a hormone that aids in sleep onset and maintenance. Because melatonin production is suppressed when exposed to high levels of blue light at night from artificial sources, the brain receives a message to stay awake.

Your child’s brain doesn’t know what time it is since they spend all day and night in front of screens and artificial light sources.

The melatonin-suppressing effects of bright light are especially noticeable to children. Melatonin levels in youngsters were found to be twice as low as in adults when exposed to the same level of light. While older children are less sensitive to melatonin suppression, younger youngsters are more susceptible.

There was a review of 36 papers in 2015 that looked at the association between sleep and the usage of digital devices in children and adolescents. It was discovered that people who utilized digital media devices before night slept less and slept less deeply. Sleep deprivation among adolescents has been on the rise since 2012, when cellphones and other portable displays became a necessity.

Screen use at night isn’t the only thing that interrupts sleep. In a study of Norwegian teenagers, researchers discovered that screen time both during the day and at night had an adverse influence on sleep.

The fast growth and development that occurs during childhood and adolescence necessitates a need for adequate sleep. If the sleep hormone is repressed from birth, they won’t be able to acquire the appropriate amount of sleep for proper growth and development. Not to mention the fact that infants and toddlers are still building appropriate nighttime sleeping habits..

Learning Problems

When it comes to affecting children’s melatonin generation, blue light exposure at night has been shown to have detrimental effects. In several sectors, poor sleep quality and lack of sleep can have serious implications. It has been shown to be associated with decreased capacity for learning and low academic achievement. When it comes to your child’s capacity to succeed in school, inadequate sleep and exhaustion are a no-brainer.

However, the problem extends far beyond interrupted sleep. High levels of blue light exposure may be affecting your child’s brain development.
Is Blue Light Destroying Your Sleep? No, but Worrying About it Is. | by Nick Wignall | The Startup | Medium

It has been found that children who spend more than two hours a day using screens — such as cellphones, tablets, and gaming gadgets — are less intelligent. Preschoolers who spend more than two hours a day in front of a screen are eight times more likely to develop attention deficit and hyperactivity disorder, according to the latest research.

Mental Health

In the last ten years, the incidence of depression, anxiety, and suicide among children and adolescents have risen, which correlates with an increase in nighttime light exposure and an increase in the usage of blue light-emitting devices. Too much artificial blue light may be to fault if your child is easily irritated, unable to regulate his or her emotions, and lacking in motivation.

By disrupting the body’s natural rhythms and activating the brain, high levels of blue light exposure may be damaging children’s mental health.

When youngsters are exposed to blue light at night, it has a negative effect on their sleep patterns and their moods. When your child is worn out, it shows in their behavior and mental state.

Teenage suicidal conduct and poor mental health have been linked in numerous studies to late-night smartphone use.

Researchers observed that persons who were exposed to low blue light (approximately 5 lux) at night were more likely to suffer from depression than those who had no exposure to blue light at all. Children and teens are more sensitive to the effects of blue light, thus it is safe to presume that the risk of depression may be even greater in young individuals..

Eye health

Do your children complain of headaches, blurred vision, or aching and tired eyes? If this is the case, excessive exposure to screens and bright lights may be to blame.

High amounts of blue light exposure pose a serious threat to eye health since it can penetrate deep into the eye and reach the retina.

As the eyes attempt to constantly refocusing, they are put under a lot of strain by the blue light from displays. Anecdotal and scientific data suggests that excessive screen use in youngsters causes eye strain. Burning, aching, and fatigued eyes, as well as headaches, impaired vision, and difficulty focusing are all symptoms of this.

Myopia, or nearsightedness, is on the rise among children who spend a lot of time in front of a computer screen, as well as those who use fluorescent desk lamps.

Weight Gain

Children’s obesity and weight growth rates are increasing. Being overweight can have a negative impact on a person’s self-esteem, but it also serves as a warning sign for more serious health conditions, such as diabetes.

Could displays and LEDs emitting artificial blue light be a contributing factor?

Children with a higher Body Mass Index (BMI) are more likely to spend time watching television.

And it’s not just a screen. Artificial light exposure in a child’s environment has been linked to an increase in BMI in a study of preschoolers in 2016.

As a result of persistent blue light exposure, poor sleep and shorter sleep durations in childhood have been linked to a higher BMI in adulthood.

This raises the possibility that children’s weight gain may continue into adulthood as a result of the negative effects of artificial light exposure. Even though we don’t know exactly how this affects sleep, exhaustion, and physical activity, we do know that increased blue light exposure and screen time is linked to these issues.

Common Sources of Blue Light for Children

Using technology is so natural to children that it frequently feels like an extension of their own bodies.

So, how much blue light are children exposed to, and how much of it is harmful?

About 60% of children’s screen time is spent watching television, with over half of 12- to 13-year-olds owning a television in their bedroom, according to the 2015 “Growing Up in Australia” report.

There were even more disturbing findings from the Australian Child Health Poll in 2017. About a third of preschoolers, two-thirds of elementary schoolers, and nearly all high school students possessed a smartphone or tablet, according to the study’s findings
Blue Light Exposure Can Affect Your Kids' Brain Development - NJ Family

In comparison to any other age group, teens spend the most time in front of a screen, whether it’s a television, computer, laptop, gaming device, smartphone, or tablet. They worked an average of over 44 hours a week, which works out to an average of six hours a day!

The average weekly time spent in front of a screen by children aged six to twelve was 32 hours. Infants and toddlers averaged 14 hours of weekly screen time for two to five-year-olds and 26 hours for two to five-year-olds.

As a result, 86% agree to using screens to keep their children occupied while they are younger than six years old..

It’s safe to infer that these alarming numbers have escalated in 2019. Apps like Snapchat, Instagram, Facebook, and Twitter are aimed at children since digital devices have become more widely available.

Besides becoming overly reliant on screens, kids these days are attending school and residing in houses outfitted with energy-saving, bright LED lightbulbs. In addition, many young children already utilize LED night lights.

Does Blue Light Cause Sleep Issues in Children?

A number of studies have found that youngsters who spend a lot of time in front of a screen are more likely to be late to bed and to fall asleep more quickly. Many research in adults have shown that light exposure in the evening and the usage of blue light-emitting devices before bed have an influence on sleep, despite the fact that these observational studies cannot prove a cause-and-effect relationship. Evidence suggests that blue light’s sleep-disturbing effects may extend to children, especially given that children’s melatonin is more sensitive to light-induced suppression.

A greater amount of study, however, is required to determine if blue light disrupts sleep or if children who have trouble sleeping are more likely to use devices (and be exposed to blue light) before bed and at night already. It’s possible that sleep and screen time have a symbiotic relationship, with one affecting the other in the opposite direction.

Effects of Sleep Loss in Kids

Even while more research is needed to determine if nighttime blue light exposure affects children’s sleep, the critical role sleep plays in children’s functioning and development is well-documented. Inattention, impulsivity, and trouble self-regulating are all associated with sleep deprivation, according to studies. Sleep deprivation has been linked to lower academic performance in children. In certain sleep-deprived youngsters, the symptoms of attention deficit hyperactivity disorder (ADHD) might be mistaken for sleep loss, leading to a misdiagnosis.

Children’s muscular mass, immune system, and cell repair are all impacted by sleep deprivation, which is when certain hormones are released.

How Can You Reduce Exposure to Blue Light?

Children’s mental and physical health depend on receiving enough sleep at night, so making sure they get that sleep is a top priority for parents. There are a number of things you and your child may do if you are concerned about the impact blue light exposure is having on your child’s sleep. Begin by implementing the following measures:

  • Set a technological curfew: Establish a nightly timetable that includes a one-hour cutoff for electronic use before going to bed. Make sure your children know when it’s time for bed by setting an alarm on their devices.
  • Prior to going to sleep, it may be beneficial to engage in other relaxing hobbies like reading, puzzles or coloring. In order to set an example for their children, parents should limit their usage of electronic devices before bedtime.
  • Set aside areas where electronic devices are not allowed: It may be tough for some children to give up their smartphones and other electronic gadgets in the bedroom, but it can have a significant impact on their nocturnal blue light exposure. Reduces the desire to use gadgets before bed and removes the potential of being woken up by messages, calls, and other alerts..
  • Blue light filters are necessary: Before going to sleep, use special glasses that block out blue light, which may help alleviate the negative effects of this light. Apps that block blue light are also available. They cause a shift in the color temperature of a tablet or smartphone’s screen to warmer light wavelengths.
  • If you’re using an electronic gadget that has a night mode or “dark mode,” you can change the screen background to black to reduce the amount of blue light you’re exposed to.
  • Using red light bulbs for reading lamps and nightlights at night may help you sleep better because it does not interfere with the creation of melatonin. Orange and yellow light, which have longer wavelengths, may also be viable possibilities.
  • Keep your circadian cycles on track by exposing yourself to intense sunlight during the day. This will help you sleep better at night. Insist that your child be exposed to as much bright, natural light as possible during the day.

If you’re dealing with an adolescent, it might be difficult to set rules and boundaries surrounding screen time. Encourage your teen to talk about the importance of sleep for his or her physical and mental well-being, and to be aware of the potential sleep-inducing effects of blue light. As a team, we could come up with guidelines for technology use. The role of parents and guardians is to model appropriate sleep habits, such as adhering to a technology curfew and storing electronic devices out of the bedroom.

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