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Sleep and technology

We live in a wired world at the height of a digital age. But even if our technologies have advanced at lightning speed in recent decades, our bodies remain unchanged and in many ways, ill-adapted to a fully plugged-in lifestyle. This mismatch between man and machine is never more clear than in the pursuit of quality sleep.

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Editor’s note: This article originally appeared at SleepyBliss, and is re-published with permission.

An understanding of how electronics affect sleep is the first step toward healthier living in the digital era and that’s what we attempt to cover in this article…

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How Prevalent Is the Problem of Late-Night Electronics Use?

Not only is the use of electronics before bed common, it’s practically a national pastime! It turns out that most Americans report using an electronic device more than once a week within an hour before bedtime.

Part of the explanation may have something to do with the convenience of the bedroom. In fact, according to a study by the National Sleep Foundation, at least one device can be found in the bedrooms of almost 90 percent of American adults and 75 percent of children’s. Moreover, many bedrooms contain multiple devices such as smartphones, laptops, televisions, tablets, and more.

But one segment of the population stands out in particular: young adults under the age of 30, a demographic where as many as 72 percent use mobile phones as part of their nightly bedtime routine. The percentage is even higher for teens between the ages of 15-17, a trend that holds true regardless of the day of the week it is (whether it’s a school night or weekend).

Thus, it should come as no surprise to learn that 60 percent of college-aged adults feel that they rarely or never get a good night’s sleep. As you might imagine, this trend has negative consequences from reduced levels of concentration and information retention to engaging in risky behaviors like driving while drowsy.

So, what exactly are Americans doing on these devices that consumes so much attention?…

Texting and More Texting

Most of the time spent on these electronic devices before bedtime is attributable to late night texting. While the numbers vary by age group, Americans on average send and receive an astounding 21 text messages in the hour before sleeping, with younger generations Y and Z doubling and almost tripling that average, respectively.

When combined with other interactive devices such as video games and laptops, it’s clear to see why people suddenly have more difficulty falling asleep than in previous years. And that’s not to mention staying asleep wherein 50% of Americans check their phones in the middle of the night!

Since use is more intensive and effects more important on younger people, the National Sleep Foundation recommends two basic strategies to deal with this problem: enforcing sleep rules and leading with the example.

7 Ways Electronics Affect Your Sleep

Whether analyzing a scientific study or examining anecdotal evidence, there’s no shortage of information confirming the direct effects of electronics on sleep, even in ways which might not immediately spring to mind:


Light exposure has a well-established role in promoting wakefulness. Thanks to sensitive photoreceptors in the eyes, the brain is able to keep track of the changes from day to night in the external world, ensuring we’re alert and asleep at the appropriate times.

While this system evolved to set the body’s circadian rhythms according to the rising and setting of the sun, it’s also receptive to the light input from electronic devices. As a result, our bodies are forced to establish new day and night set points that impact all our organ systems and overall health.


Melatonin — the body’s natural nighttime “off switch” hormone — is an important component to establishing the body’s circadian rhythm. As evening approaches, melatonin levels increase and lead to a state of drowsiness that promotes sleep. Towards morning, melatonin levels taper off and a state of wakefulness is once again restored.

Now, the timing of the cyclical changes in melatonin levels is controlled in large part by the levels of light in the environment. Among the most common sources of light exposure in the evening when the natural environment is dark are the screens on electronic devices.

Instead of allowing decreased light from the natural environment to stimulate the release of melatonin every night, the blue light emitted from the screens on laptops, televisions, smartphones and other devices actually inhibit melatonin production.

Apart from blue light exposure, anecdotal evidence also seems to suggest that electromagnetic radiation (EMR) emitted from electronic devices may also suppress the production of melatonin.

In short, the lower the amount of melatonin, the more difficult it becomes to fall and stay asleep.


Cognitive stimulation is one of the key ways nighttime electronic use affects your sleep, especially since many of the activities tend to be stress and anxiety-inducing.

The combination of light from a screen together with the changing visual and sound input from a television show or late-night video game is enough to stimulate the mind and reduce the natural nightly sleep-producing hormone melatonin.

Even something as simple as a late-night email can keep your brain alert and muscles tense during a time when they should be relaxing. And lest you think nighttime learning gets a green light, educational activities can also stimulate the body with the release of stress hormones like adrenaline and cortisol.

There’s also the temptation to stay up later just to continue binge-watching a favorite series or checking up on social media. Sound familiar? The process goes something like this…

You start to use a device like a smartphone or tablet and you become more alert. In this attentive state, you feel compelled to continue using the gadget, thus further delaying your bedtime. Before you know it, you significantly cut into your precious sleep time!

As you’d expect, the short night combined with excessive exposure to the device causes you to awaken the next morning feeling groggy and less alert throughout the day.


When comparing a group of participants reading from an electronic device before sleeping with participants who read a paper-formatted book, it’s been shown that using electronic devices before bedtime is associated with a slower onset of sleep. Moreover, several studies focused on exposure to video games prior to sleep also found a delayed sleep onset latency.


Even when you finally get to sleep, the quality is average at best since exposure to electronic devices before bedtime delays and decreases the total amount of time spent in REM sleep — the restorative, dreaming part of the sleep cycle crucial to learning and memory retention. As a result, you feel less rested and alert the following morning and become more susceptible to health-related issues over time (more on that in a moment).


Smartphone notifications are part of what makes these devices so handy. But they’re not so convenient when they go off in the middle of the night! As many as 10 percent of Americans leave the ringer on their phones turned on during sleeping hours. And even when the phone ringer is set to silent, just keeping the device in the bedroom increases the temptation to use it if/when you wake up in the course of the night.

Moreover, all electronics emit some amount of light, whether it’s something as small as a digital alarm clock or as big as a flat screen television. Even when switched off, the LED lights from power adapters on many electronics can be sufficiently bright to cause sleep disturbance. Generally speaking, the darker the room, the better the sleep.


One of the main reasons for feeling less refreshed by sleep in the morning is due to exposure to blue light the previous evening. As opposed to other wavelengths of light, it’s been shown that people exposed to electronic screens before bedtime are more likely to arouse from sleep throughout the night than those who forgo the devices.

Interestingly, the correlation between electronic use and feeling unrested is independent of the number of hours of sleep attained. Case in point, people exposed to electronics before bedtime have been shown to feel less rested than those who sleep the same number of hours without using electronics before sleeping.

The Long-Term Repercussions of Poor Sleep Quality

Feeling constantly sluggish and tired due to excessive electronic use at night is bad enough but it gets worse as chronic sleep deprivation and poor quality of sleep has been linked to all sorts of health-related problems down the road, such as:

  • A weakened immune system
  • Mood disorders like depression and/or anxiety
  • Type 2 diabetes
  • Heart disease
  • Breast, colorectal, and prostate cancer
  • Restless leg syndrome (RLS)
  • Excessive weight gain