THELong Childhood.
A1 · Individual claim · Sleep

Pre-bed screen use delays sleep onset and shortens sleep

Does the timing of screen use change when children fall asleep—and how long they sleep?

Evidence-record prototype. This is the claim being tested, not a verified conclusion. No completed scientific review is presented here.

Our assessment

Verdict not yet assigned.

Evidence confidence

Not assessed

Practical effect size

Not yet extracted

The original ledger predicted “Strong”. That was a provisional editorial prediction, not a reviewed finding, and is not used as the public verdict.

Exactly what are we testing?

Exposure
Screen use before bedtime. The time window, duration, activity and device must be specified for each study.
Comparison
Less use, no use or earlier use, depending on the study design.
Outcomes
Time of falling asleep, time taken to fall asleep, and total sleep duration—reported separately.
Ages
To be extracted from the studies. The homepage’s broad age tags are navigation examples, not verified applicability.

The evidence ledger

There are no appraised studies in this prototype. Effect sizes, sample sizes and confidence intervals will be added only after extraction from the source papers.

Context source · Not graded evidence

American Academy of Pediatrics sleep guidance

The AAP recommends an hour without screens before bedtime and keeping screens outside bedrooms. Read the guidance.

This is advice for families. It does not, by itself, quantify the causal effect of pre-bed use or resolve the exact wording of A1.

What could change the verdict?

Cause, correlation and reverse direction

We need to test whether screen use precedes the sleep change, whether changing use changes sleep, and whether children with difficulty sleeping turn to screens more often.

Different activities, different exposures

Television, messaging, gaming and schoolwork should not be collapsed without checking whether the evidence supports that grouping.

Measurement and family routines

We need to distinguish device logs from recalled use, and measured sleep from reported bedtimes. Other differences in routines must also be considered.

Averages are not guarantees

Any effect estimate must retain its population, comparison and uncertainty. A group average cannot promise the same improvement for an individual child.

What does this mean for parents?

This record does not yet justify a site-authored causal conclusion. For a practical starting point, the question page separates published professional guidance from our unfinished evidence assessment.

Parent question using A1

Screens before bed: what should we change?

Read the practical answer and see the other claims it needs →

Review history

11 September 2026
Prototype created. Claim wording retained from the founders’ ledger; context guidance checked.
Scientific review
Pending. No reviewer assigned.
Next review
Date not yet scheduled.