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Screens Before Bed: What Sleep Research Actually Says About the 1-Hour Rule

November 2, 2026 · 7 min read

Child's bedroom at night with a lamp, an alarm clock and books on the bedside table, while a phone charges outside the room.

Every parent seems to have their own screen rule for the evening, picked up from a friend, a paediatrician or an article half-read on a phone, and few of us are entirely sure ours is the right one. Bath done, pyjamas on, and one episode stands between you and a quiet evening. Then the doubt creeps in: wasn't there a rule about no screens for an hour before bed?

There is. Or rather, there are several, and they don't agree. Depending on where you live, paediatricians tell you to switch off 30 minutes before bed, an hour before, or don't give a number at all. Meanwhile, a 2024 study that filmed young teenagers in their bedrooms found that screens in the two hours before bed made almost no difference to their sleep that night. What did make a difference was where the screen was being used.

So let's look at it properly: what each country recommends, what the studies actually measured, and what families really do in the evening.

What different countries actually recommend

Almost every official body agrees on the goal: protect the run-up to sleep. They disagree on how long that run-up should be, and some don't set a buffer at all.

CountryWho says itScreen-free buffer before bedRelated advice
United StatesWho says itAmerican Academy of Pediatrics, 2016 [1]Screen-free buffer before bed30 minutesRelated adviceNo TVs, computers or other screens in children's bedrooms
CanadaWho says itCanadian Paediatric Society, 2017 and 2019 [2][3]Screen-free buffer before bedAt least 1 hourRelated adviceUnder 2: no screen time. Ages 2 to 5: less than 1 hour a day
United KingdomWho says itRoyal College of Paediatrics and Child Health, 2019 [4]Screen-free buffer before bed1 hourRelated adviceNo overall daily limit; no evidence that night modes help
AustraliaWho says itRaising Children Network (government-funded) [5]Screen-free buffer before bed1 hourRelated adviceReading or quiet play instead
DenmarkWho says itDanish Health Authority, 2025 [6]Screen-free buffer before bedUnder 5: no screens for bedtime stories. Ages 5 to 17: app limits, for example an hour before bedRelated adviceA regular alarm clock instead of a phone in the bedroom
FranceWho says itExpert commission on screens, 2024, and French ambulatory paediatricians [7]Screen-free buffer before bed"Not before going to sleep", no national figureRelated adviceNo screens before age 3; none in the morning, at meals or in the child's bedroom
JapanWho says itJapan Pediatric Society and Japan Pediatric Association, 2004 [8]Screen-free buffer before bedNo national figure; local health leaflets say 1 hour [9]Related adviceTotal media time up to 2 hours a day; no TV in children's rooms
ChinaWho says itMinistry of Education, 2021 [10]Screen-free buffer before bedNo buffer: a fixed bedtime insteadRelated advicePrimary pupils in bed by 21:20 with 10 hours of sleep; no online games for minors from 22:00 to 08:00
WHOWho says itGuidelines for children under 5, 2019 [11]Screen-free buffer before bedNoneRelated adviceUnder 1: no screen time. Ages 2 to 4: no more than 1 hour a day

Two things stand out. First, the famous hour is not a measured threshold. The UK college's evidence review concluded it could not recommend any time cut-off for screens, then adopted the one-hour rule as an expert recommendation [4]. It is a sensible rule of thumb, not a finding.

Second, the countries that are strictest about children's sleep don't necessarily use it. China regulates the bedtime itself and switches off online games for minors at 10pm [10], while Japan and France put the emphasis on keeping screens out of the bedroom [7][8].

What the research actually shows

The link is real. A 2016 meta-analysis pooling studies of more than 125,000 children found that using a device at bedtime roughly doubled the odds of not sleeping enough, and was also linked to poorer sleep quality and more daytime sleepiness [12]. More surprising: children who simply had a device in their bedroom, without using it, slept worse too. These are observational studies, so they show a link rather than prove a cause, but the pattern is consistent.

Researchers see three ways screens get in the way:

  • Time. "One more episode" pushes bedtime back. Sleep doesn't stretch to make up for it the next morning, especially on school days.
  • Arousal. A tense game or an endless feed keeps the brain switched on just when it should be winding down.
  • Light. Evening light holds back melatonin, the hormone that tells the body it's night. Young children are unusually sensitive: in a 2022 study of 36 children aged 3 to 5, an hour of light before bed suppressed melatonin by 70 to 99%, even at dim intensities, and in more than half of them it still hadn't recovered 50 minutes later [13]. That study used room lighting rather than tablets, but it suggests the light argument weighs more the younger the child.

The 2024 study that complicates things. Researchers in New Zealand fitted 79 children aged 11 to 14 with cameras for the two hours before bed, filmed them in their bedrooms, and measured their sleep with wrist sensors over four nights [14]. Screen use in the two hours before bed had no link with most measures of sleep that night. Once the screen came into bed, though, it was a different story: sleep started later, and every 10 minutes of interactive use (gaming, messaging, scrolling) cost about 9 minutes of sleep, against about 4 minutes for passive watching. The authors' own suggestion is simple: keep devices out of the bedroom, rather than banning them from the whole evening.

So is the 1-hour rule wrong? Not exactly. It's incomplete. The New Zealand study looked at young teenagers over four nights, and younger children are far more sensitive to evening light. Taken together, the research points to a ranking rather than a single rule: no screens in bed comes first, calm content beats interactive content, and the screen-free buffer matters more the younger the child.

What families actually do

Guidelines are one thing, 8pm on a Tuesday is another. Parent surveys show a clear gap between the two, and it's worth looking at without guilt: it says more about tired families than careless ones.

  • United States. About 1 in 5 children aged 8 and under use a mobile device to fall asleep, calm down or get through meals [15]. Among parents of 1 to 6 year olds, 90% have a bedtime routine, but only 41% include switching off devices in it, and parents who struggle most at bedtime are more likely to leave a show or video on [16].
  • France. In a 2022 survey of 1,015 parents of children aged 6 months to 10 years, 55% of children spent more than an hour on screens after 5pm on weekdays, and 11% fell asleep with a screen on in their room. Those children took 48 minutes to fall asleep instead of 30, and had twice the rate of sleep problems (49% against 24%). And 60% of the parents used screens in bed themselves [17].
  • China. In a 2019 national survey of children's sleep, 41.9% of poor sleepers used a TV, phone or computer before bed, against 7.4% of good sleepers [18].

Read side by side, these numbers point to the same weak spot: the bedroom. In France, "no screens in the child's bedroom" is official advice, yet about 1 child in 9 falls asleep with one on. In the US, most bedtime routines don't include switching off at all. And screens often come into bedtime for an understandable reason, as a way to settle a child at the end of a long day. That's precisely the use the research is clearest about.

What this means for your evenings

Each child and each day are different, bedtime routines and screen rules are probably different in every family, so a precise, complete picture of what works for everyone is out of reach. But if you change only one thing, make it the bedroom. Everything else is fine-tuning.

  1. Screens stay out of the bed, and ideally out of the bedroom. This is where national guidelines and the newest research agree most [1][4][14]. A basic alarm clock settles the "but I need my phone to wake up" debate [6].
  2. The younger the child, the earlier the switch-off. For preschoolers, a screen-free hour before bed is worth protecting, given how strongly evening light affects them [13]. If an hour feels out of reach tonight, 30 minutes is still what US paediatricians recommend [1].
  3. Calm content last. If a screen is part of the evening, make it the passive, predictable kind. A gentle show is not the same as a competitive game or a busy group chat [14].
  4. Fill the gap. "No screens" rarely works on its own: a screen-free hour needs something in it. And that's often the hardest part at 7pm, when you're tired and your child is either bouncing off the walls or melting into the sofa.

That last point is where Belxi can help. Tap that it's a low energy evening, and Belxi suggests calm, screen-free activities matched to your child that work as a wind-down. Something to do in the hour before bed, rather than another negotiation about what not to do.

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