Topic hub
Digital childhood: screens, AI and what it costs
Screen time arithmetic, online safety, AI companions and the trade-offs nobody quantifies.
The screen-time findings with the strongest evidence concern sleep, not attention or mood. Evening screen use delays sleep onset consistently across studies, and sleep loss then explains much of what is often attributed directly to screens.
Screen time is discussed almost entirely in moral terms and almost never in arithmetic ones.
Four hours a day from age three to eighteen is 21,900 hours. That is the entire waking life of a four-year-old, twice over. Whether that matters is a real question. How much it adds up to is not — it is just multiplication, and almost nobody does it.
What we cover here
- Lifetime screen hour arithmetic
- The sleep evidence, which is the strongest
- Online safety, including the settings that actually matter
- AI companions and boundary design
- What changes when families reduce, and on what timeline
Articles in this hub
YouTube Kids vs YouTube: which is safer for your child?
YouTube Kids is a filtered app for ages 4-12; regular YouTube is an open platform. This guide compares…
The EU Age Verification App: Where It Stands in Each Country, and Why Websites Ask Your Age
Is the EU age verification app out yet? Status in all 27 EU countries on 18 October 2026,…
How Old Do You Have to Be for TikTok, Snapchat, Roblox and ChatGPT? Every App's Minimum Age
The minimum age in each company's own terms for 28 apps and games and 10 AI chatbots, what…
Is Australia's Social Media Ban Working? What the First Ten Months Show
Australia's under-16 ban took effect on 10 December 2025. More than 5 million accounts were removed, yet 42%…
Digital Age of Consent in Europe: The GDPR Age in Every Country (13 to 16)
The age a child can consent to apps using their data without a parent: 13 in the UK,…
Social Media Laws for Minors by State (2026): Which Are in Force and Which Are Blocked
Florida's under-14 ban is in force after a 14 October 2026 ruling; Georgia's returned a day later. Every…
UK Social Media Ban for Under-16s: Start Date, Which Apps, and What Changes for 16-17s
The UK will block under-16s from Snapchat, TikTok, YouTube, Instagram, Facebook and X, with the first rules expected…
Which Countries Ban Social Media for Children? Every Law, Bill and Plan (October 2026)
Australia, Malaysia and Brazil have under-16 social media rules in force; Turkey starts in November 2026. The UK,…
Teens share their location 24/7 — what parents of the Snap Map generation should know
Gen Z shares real-time location with friends more than any generation. Here is what the research says about…
Roblox parental controls: a parent's 2026 guide to chat, content and screen time
Roblox's 2026 changes (age checks for chat, Kids and Select accounts, spending and screen-time limits) explained, with a…
Parental Controls Compared: iOS Screen Time vs Google Family Link vs Microsoft Family Safety vs Qustodio
A 2026 parent's guide comparing Apple's Screen Time, Google Family Link, Microsoft Family Safety and Qustodio on price,…
Screen Time Recommendations by Age: What the US, UK, Canada, Australia and WHO Say in 2026
Official screen time guidance by age from the AAP, the UK government, Canada, Australia and WHO. They agree…
Is Brain Rot Real? What the Word Means, and What the Research Actually Shows
Brain rot is not a medical condition. The research on heavy online use finds real but mostly small…
Homework With a Phone Beside It Is Not Multitasking. It Is Switching, and Switching Costs
Nobody does two thinking tasks at once. The mind switches between them, every switch costs time, and practice…
In 126 of 194 Countries There Are More Mobile Subscriptions Than People
The median country has 114 mobile subscriptions per 100 people. Montenegro has 222. It is the most quoted…
A Third of "Slang" Is Not Words at All. It Is Grammar
Of 212 classified dictionary entries, 38 are phrases and 69 are multi-word. Looking up single words misses the…
Nobody Can Actually Check a Child's Age Online
Every major platform sets 13 and verifies it by asking. Every alternative method fails on privacy, accuracy or…
Youth Slang Does Not Turn Over in Months. The Median Term Is Seven Years Old
Across 207 datable terms in our dictionary the median has been current for seven years, and 190 are…
TikTok Did Not Invent the Slang. It Distributed It
Across 223 dictionary entries, TikTok is named in 16 origin notes — and in 13 of them as…
Three Quarters of the World Has No Child Screen-Time Data At All
Only 42 of 194 countries have a published child screen-time figure. The other 152 are blank — and…
How Old Was Each Generation When It Met the Internet? 50, Then 30, Then 3
Boomers met the internet in their fifties, Gen X in their late twenties, Millennials at twelve. Gen Alpha…
What "Digital Native" Gets Wrong About Gen Alpha and Gen Beta
The phrase assumes every child in a cohort meets the same technology. Internet access runs from 100% to…
Why Children Play Roblox and Fortnite — It Is Not Really About the Game
Gaming is about a quarter of children's screen time, and the reason children give for playing is not…
Screen Time: What the Evidence Actually Supports (and What It Doesn't)
One screen-time finding replicates reliably. Most of the rest is contested. Here is the difference, and what it…
Child Sleep and Screens: The One Finding Worth Acting On
Of everything in the screen research, sleep is the part that replicates. Here is the mechanism, the numbers…
Tools for this topic
AI Chatbot Age Limits
How old a child must be to use ChatGPT, Gemini, Meta AI,…
App Age Requirements Chart
The minimum age for 28 apps and games and 10 AI chatbots,…
App Time Audit
Break weekly screen hours down by app and see which single app…
App Time Breakdown
Where the hours actually go by category once you split the total…
Background TV Exposure Calculator
Television on with nobody watching — which affects early language exposure more…
Bedroom Device Risk Score
Score the sleep risk of what is currently in the bedroom, weighted…
Bedtime Drift Tracker
How far bedtime has slipped over a term, and what it costs…
Evening Screen Exposure
How late-evening screen use relates to sleep onset, and which of brightness,…
Evening Screen Sleep Impact
Estimate how much evening screen exposure delays sleep onset, and what that…
Overnight Charging Relocator
What moving overnight charging out of the bedroom returns, in sleep minutes…
Co-Viewing Time Tracker
Time spent watching with a child rather than near them — the…
Content Rating Decoder
What each age rating system actually means, side by side — PEGI,…
Frequently asked
Is screen time bad for children?
The evidence is strongest for sleep disruption from evening use, weaker and more contested for attention and mood. What is displaced matters more than the total.
What is the single most effective change?
Devices out of the bedroom overnight. It is the most consistently effective intervention in the literature and the easiest to enforce.
How long until changes show?
Families typically report sleep changes in about two weeks and mood or attention changes in three to four.