Elementary school children show substantial day-to-day within-person fluctuations in sleep quality, time in bed, daytime tiredness, and working memory performance¶
Claim · All claims
Evidence · 1 study · associationalr2·q3
Currency · newest study 2015 · checked against its sources 2026-10-19 (automated, 1 of 1 entry) · not reviewed by a person · overdue for a recheck since 2020: baselines and conditions change
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? Children's nightly sleep quality, time in bed, daytime tiredness, and daily working memory performance fluctuate substantially within persons across days. → Könen 2015
Evidence¶
Könen 2015¶
Könen, T., Dirk, J., & Schmiedek, F. (2015). Cognitive benefits of last night's sleep: daily variations in children's sleep behavior are related to working memory fluctuations. Journal of Child Psychology and Psychiatry, 56(2), 171–182. https://doi.org/10.1111/jcpp.12296
q3 · i? · associational · r2
Micro-longitudinal ambulatory assessment in which 110 third- and fourth-graders reported sleep and completed working memory updating tasks on smartphones several times per day for 31 days. The authors report they "identified substantial fluctuations in the children's daily cognitive performance" and in all three sleep facets.
"We identified substantial fluctuations in the children's daily cognitive performance, self-reported nightly sleep quality, time in bed, and daytime tiredness."
Discussion¶
Related Claims¶
- Older adolescents show high night-to-night variability in free-living sleep duration, which may obscure sleep-cognition associations — related
- Sleep and consolidation support semantic memory development, suggesting delayed school start times may benefit memory — related
- Most variance in students' epistemic emotions was situational (within-person) fluctuation, with 18–37% due to between-person variability. — related
- Children with lower average working memory performance show stronger within-person coupling between nightly sleep quality and morning performance
- Situational motivation is highly context-dependent and fluctuates within and between learners, but most studies rely on self-reports — related
- Previous night's sleep quality and time in bed predict children's morning working memory performance fluctuations — a narrower finding that bears on this claim
- Current daytime tiredness predicts children's afternoon working memory performance fluctuations — a narrower finding that bears on this claim
- Fatigue depends on age, sex, lesson length and number, time of day, weekday, recesses, holidays, rest, sleep, nature of work, school program, and teacher personality (Offner's laws of fatigue) — related
- Elementary school children show substantial within-person day-to-day fluctuations in working memory performance in the school context — a narrower finding that bears on this claim
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
children-daily-fluctuations-sleep-and-working-memory |
title |
Elementary school children show substantial day-to-day within-person fluctuations in sleep quality, time in bed, daytime tiredness, and working memory performance |
description |
Elementary school children show substantial day-to-day within-person fluctuations in sleep quality, time in bed, daytime tiredness, and working memory performance |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2015 |
source_checked |
2026-10-19 |
recheck_by |
2020 |
generated |
by process:wiki-ingest on 2026-10-16 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — könen-2015 |
Frontmatter is the page's machine-readable record — see the Schema & Guide.