Guide
Is your phone bad for you? What the research says.
Headlines swing between phones ruining a generation and the whole worry being a moral panic. The research is calmer than both.
In short. The clearest evidence is on the road: the WHO says drivers using a phone are about four times more likely to crash, and hands-free phones are not much better. Screens before bed and notifications have measurable effects in studies. For well-being the average link is small, but a minority of young people struggle to control their use. Most of what helps is simple and free.
Sleep
In a sleep-lab study, people who read on a light-emitting e-reader in the evening took longer to fall asleep, made less of the sleep hormone melatonin, had their body clock shifted later and were less alert the next morning than when they read a printed book. Among teenagers, WHO Europe links problematic social media use with less sleep and later bedtimes. More in your phone before bed.
Focus
You do not have to pick the phone up for it to cost you. In an experiment, a notification alone disrupted performance on an attention-demanding task, comparably to actively using a phone for calls or texts. More in what one buzz costs.
On the road
This is where the evidence is plainest. According to the WHO, drivers using a mobile phone are about four times more likely to be involved in a crash; using a phone slows reactions and makes it harder to keep to the lane and to a following distance; hands-free phones are not much better than hand-held ones, and texting raises the risk considerably. That goes for any voice assistant, ours included: do not use one while driving.
Eyes
The American Academy of Ophthalmology says long screen time does not permanently damage your eyes, but it can make them dry, tired and blurry, partly because people blink far less while looking at a screen. More in digital eye strain.
Neck
“Text neck” is a popular worry. A study of 150 young adults in Brazil found no link between neck posture while texting and neck pain; it is one study, of young people, at one point in time. More in text neck.
Young people and children
WHO Europe’s survey of almost 280,000 young people aged 11, 13 and 15 in 44 countries and regions found problematic social media use rising from 7% in 2018 to 11% in 2022, with 12% at risk of problematic gaming. “Problematic” means signs like losing control over use and neglecting other things: the signs, and what to do. For children under five, the WHO recommends little or no sedentary screen time. More in screen time for young children. More numbers for Europe: screen time statistics.
What the research does not show
A large analysis of three datasets with 355,358 adolescents found the link between digital technology use and well-being to be negative but small: it explained at most 0.4% of the differences in well-being, and the evidence is correlational. WHO Europe also notes that heavy users who were not problematic users reported stronger support from friends. Hours alone are a blunt measure; what you do with them, and whether you can stop, matter more.
What helps
- Let people through, not apps. Turn off notifications except calls and messages from people.
- Keep the phone out of the bedroom. A cheap alarm clock does the one job it did there.
- Driving mode, every time. Set it to switch on by itself in the car.
- Look up. Breaks for your eyes, your neck and your attention are the same break.
- Try grayscale. A small trial found less daily screen time: grayscale phone.
- Put it away with people. Phubbing is easy to fall into.
- Watch the bad-news loop. Doomscrolling, and whether a digital detox helps.
- Know your number. Your phone counts your screen time; see what it adds up to in the screen time calculator.
Fewer small reasons to pick it up
Lychnos Ring is not a health product and makes no health claims. It is being built to take over some of the small reasons to pick up the phone (the time and your next meeting, an important email, a quick question) so the phone can stay in your bag more often. It is in development; see an assistant that works without your phone.
More guides like this one: phone habits, what the research says.
Eight popular claims about phones, from the goldfish attention span to the dopamine detox, checked against the evidence: phone myths.
Sources, read 4 November 2026: Chang, Aeschbach, Duffy and Czeisler, PNAS, 2015; Stothart, Mitchum and Yehnert, Journal of Experimental Psychology: Human Perception and Performance, 2015; WHO, road traffic injuries fact sheet; American Academy of Ophthalmology, computers, digital devices and eye strain; Damasceno and others, European Spine Journal, 2018; WHO Europe, teens, screens and mental health, 25 September 2024; WHO, guidelines for children under five, 24 April 2019; Orben and Przybylski, Nature Human Behaviour, 2019. General information, not medical advice.
Questions
Is using a phone before bed bad for sleep?
In a sleep-lab study, people who read on a light-emitting e-reader before bed took longer to fall asleep and were less alert the next morning than when they read a printed book. Keeping the phone out of the bedroom is the simplest step.
Do notifications affect concentration?
In an experiment, simply receiving a phone notification, without picking up the phone, disrupted performance on an attention task about as much as using the phone did.
Is screen time bad for teenagers?
Large studies find the average link between technology use and teenagers' well-being is small. WHO Europe reports that problematic social media use among adolescents rose from 7% in 2018 to 11% in 2022, so for some the way they use it is a real problem.