Colin Snow
Keeping your phone near your head while sleeping can negatively impact your health in several ways. Firstly, the blue light emitted by phones inhibits melatonin production, making you more alert and disrupting your natural sleep cycle. Secondly, the radiation emitted by phones, while not proven harmful, has been linked to an increased risk of cancer, according to some studies. Additionally, late-night notifications can stimulate your brain and disturb your sleep. To ensure quality rest, it is recommended to limit phone use before bed and maintain a comfortable, screen-free bedroom environment.
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What You'll Learn
Poor sleep quality
Several studies have been conducted to assess the impact of mobile phone usage on sleep quality. One study found that higher mobile phone usage was associated with poor sleep quality. Another study of Japanese adolescents found that increased mobile phone usage before sleep was linked to shorter sleep duration and poorer sleep quality. A similar study in India found that 22.61% of participants reported poor sleep quality, with higher mobile phone usage.
The impact of mobile phones on sleep quality may also be due to other factors beyond blue light exposure. A large cohort study found that high mobile phone call times were associated with insomnia, but this was not due to RF-EMF exposure. Instead, other factors associated with mobile phone usage may be responsible.
To improve your sleep quality, it is recommended to limit your overall phone use, especially one hour before bed. Keeping your phone a few feet away from you while sleeping can also help reduce exposure to blue light and prevent overheating of your phone's battery. You can also enable ""do not disturb" mode to limit distractions from late-night notifications.
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Blue light inhibits melatonin production
Keeping your phone near your head while sleeping can negatively impact your sleep quality. Research has found that people who use their phones frequently, especially before bedtime, are more likely to experience insufficient and poor-quality sleep. This is because phones emit blue light, which inhibits the production of melatonin, the hormone that makes us feel tired.
Blue light is a portion of the visible light spectrum that can influence alertness, hormone production, and sleep cycles. It is emitted by LED and fluorescent lights, as well as many electronic devices, including smartphones. Exposure to blue light in the hours leading up to bedtime can disrupt the natural sleep-wake cycle, or circadian rhythm, by suppressing the body's release of melatonin. This hormone influences circadian rhythms and usually increases before bedtime, making us feel drowsy. However, blue light exposure can trick the brain into thinking it is still daytime, leaving us feeling alert instead of tired.
Harvard researchers conducted an experiment comparing the effects of exposure to blue light and green light of comparable brightness. The blue light suppressed melatonin for about twice as long as the green light and shifted circadian rhythms by twice as much. Another study by researchers at the University of Toronto compared the melatonin levels of people exposed to bright indoor light wearing blue-light-blocking goggles to those exposed to regular dim light without goggles. The levels of melatonin were about the same in both groups, strengthening the hypothesis that blue light is a potent suppressor of melatonin.
To reduce exposure to blue light, it is recommended to limit screen time, especially one to two hours before bed. You can also use the "do not disturb" mode on your phone to limit distractions, or try alternatives such as reading, listening to calm music, meditating, or talking with a partner. Additionally, you can use blue light-blocking glasses or install an app that filters the blue/green wavelength to reduce your blue light exposure.
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Risk of severe burns
While there are many reasons to avoid keeping your phone near your head while sleeping, one of the most concerning is the risk of severe burns.
Phones emit low levels of radiofrequency (RF) energy, a form of non-ionizing radiation. While there is no evidence that non-ionizing radiation is harmful, it may heat your tissues. However, the levels emitted by phones are not high enough to cause this. Despite this, phones can still overheat, especially if they are kept under a pillow or blanket, where the heat has nowhere to dissipate. This can cause severe damage to the phone's battery and increase the risk of fire. In 2014, a 13-year-old girl from Dallas woke up to find her Samsung Galaxy S4 on fire under her pillow. Similarly, in 2021, a 17-year-old girl suffered severe burns to her cheek when her charging iPhone caught fire on her bed as she dozed. These incidents are rare, but they do occur, and phone companies warn against keeping phones under pillows in their user guides.
To reduce the risk of overheating and fire, it is recommended to keep your phone at least a few feet away while sleeping. This will also reduce your exposure to blue light, which can disrupt your natural sleep cycle by inhibiting melatonin production and making you more alert. Research has linked phone and screen use before bed to poor sleep quality and disruptions in the natural sleep-wake cycle, or circadian rhythm. Insomnia rates have risen with increased phone use, and blue light is not the only factor. The stimulation and overstimulation from phone activities and the bright light of the screen can make it hard to fall and stay asleep.
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Radio frequency (RF) energy
Cell phones emit low levels of RF energy, and the human body does absorb this energy. The only consistently recognized biological effect of RF energy absorption is a slight heating effect in the area of the body where the phone is held, such as the head or ear. However, this heating is not enough to raise core body temperature. While there are no established dangerous health effects of RF energy on the human body, it is always a good idea to follow recommendations from organizations like the FDA to reduce exposure if you are concerned.
The FDA suggests reducing the amount of time spent using your cell phone, especially before bed, as the blue light emitted by phones can inhibit melatonin production and negatively impact your sleep quality. Using speaker mode, headphones, or earbuds can also help increase the distance between your head and the phone, reducing RF exposure. Additionally, consider texting instead of calling, as RF transmission power increases when the signal is weak. Using hands-free options can dramatically decrease RF exposure.
It is worth noting that the National Institute of Environmental Health Sciences (NIEHS) supports the claim that there is no conclusive link between cell phone use and adverse health problems. However, more research is needed to fully understand the potential long-term effects of RF energy exposure. While there may not be cause for immediate concern, maintaining a healthy distance between yourself and your phone, especially while sleeping, can help ensure quality rest and reduce potential RF exposure.
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Brain cancer risk
There is no concrete evidence that keeping your phone near your head while sleeping will cause brain cancer. The National Cancer Institute, the Food and Drug Administration, the Centers for Disease Control and Prevention, and the Federal Communications Commission all agree that there is no reason to believe that cell phones cause cancer. Dr. Neha Narula, a clinical assistant professor of medicine at Stanford University, also agrees that there is no evidence that the radiation emitted by smartphones affects our health long-term.
However, it is important to note that cell phones do emit low levels of radio frequency (RF) energy, a form of non-ionizing radiation. While there is no evidence that non-ionizing radiation is harmful, it is possible that it could have long-term effects on health that are not yet understood. The International Agency for Research on Cancer has classified this type of radiation as a "possible human carcinogen".
In addition, a July 2023 study published in the journal Cancers found a positive but weak correlation between death from brain cancer and mobile phone usage. However, the co-author of the study, Shabbir Syed Abdul, stated that definitive conclusions cannot be made at this point.
While the risk of brain cancer from keeping your phone near your head while sleeping may be low, it is still recommended to keep your phone away from your bed to ensure quality sleep. Research has linked phone and screen use before bed to disruptions in the natural sleep-wake cycle, or circadian rhythm. Blue light emitted by phones inhibits melatonin production, making it harder to fall asleep and reducing the quality of sleep.
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Frequently asked questions
Keeping your phone near your head while sleeping can negatively impact your sleep quality. The blue light emitted by your phone inhibits melatonin production, making you more alert and less sleepy. Notifications can also disrupt your sleep.
There is no concrete evidence that keeping your phone near your head while sleeping causes cancer. While cell phones emit non-ionizing radiation, which has the potential to increase cancer risk, the radiation is not deeply penetrative.
It is recommended to keep your phone at least 30 centimetres (12 inches) or a few feet away while sleeping to reduce exposure to blue light.
Instead of using your phone before bed, you can try reading, listening to calm music, meditating, or talking with a partner. These activities can help you relax and make you tired before bed.
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