KidenceWhat the signals mean — and what the research actually says
Kidence turns a phone's own activity log into four calm, observational signals. Here's the evidence behind each one, in plain language, with the sources we relied on.
First, the reassuring part. For most children, everyday screen use is not harmful. Large, careful studies find the link between digital-technology use and adolescent well-being is real but very small — on the order of a fraction of a percent of the difference between teens (Przybylski & Weinstein, 2017). Kidence is here to surface gentle patterns worth a conversation — never to diagnose, alarm, or label your child.
Sleep & screens
What the research says
This is the best-supported of the four. Pediatric and sleep-medicine bodies consistently link screen use close to bedtime with shorter and lighter sleep, which can affect next-day focus and mood. The American Academy of Pediatrics suggests screens off about an hour before bed and devices kept out of the bedroom, and meta-analyses find pre-bed screen use is associated with shorter sleep and a later sleep onset in children.
- AAP — Screen time & sleep (Q&A)
- Meta-analysis: pre-bed screen use & child sleep (2025)
- AASM consensus — recommended sleep durations for children
What can help
Many families agree on a "screens off" time 30–60 minutes before bed, and charge devices outside the bedroom. A fixed clock can't know your household's real schedule, so treat the timing as a reference point, not a rule.
Focus & attention
What the research says
Frequently switching between apps — sometimes called media multitasking — is associated in longitudinal research with more fragmented attention in younger adolescents. The effects are small and run in both directions (children who are more distractible may also switch more), and the studies measured self-reported multitasking rather than passive switch logs. We frame this as a switching habit, not an attention disorder.
- Baumgartner et al. — media multitasking & attention (longitudinal, N>2,000)
- Systematic review: digital media & later attention symptoms (2022) — small, bidirectional effects
What can help
One-app-at-a-time during homework, with notifications paused, can make sustained focus a little easier. None of this is a measure of intelligence or ability.
Balance & usage patterns
What the research says
The useful lens here is displacement, endorsed by the AAP's media guidance: the question isn't a raw number of minutes, but whether screen time is crowding out sleep, schoolwork, movement and offline activities. Heavy engagement without harm is not a disorder — the ICD-11 definition of gaming disorder rests on impaired control and real-life impairment, explicitly not on time spent. Passive activity data can't observe harm, so we present this as a balance signal, never as "addiction."
- AAP policy (2026) — quality, context & displacement; the Family Media Plan
- Billieux et al., World Psychiatry (2021) — disorder is impaired control, not time
What can help
Look together at which activities feel squeezed — sleep, study, time outdoors — and protect time for one of them, rather than fixating on a total.
Checking habits
What the research says
Frequent pick-ups can interrupt focus during study and family time. For context, a device-logged study of 11–17-year-olds found a median of about 51 pick-ups a day, with a very wide range — so a high number is common and not, on its own, a cause for worry. There is no established norm for under-11s, so we treat younger-age figures as estimates. We describe this as a checking habit, not hyperactivity.
What can help
A couple of agreed phone-free windows — meals, or homework — tend to do more than counting pick-ups. The number is a description of a habit, not a verdict.