Previous night's sleep quality and time in bed predict children's morning working memory performance fluctuations¶

Claim · All claims
Evidence · 1 study (2 entries) · associational r2 · q3
Currency · newest study 2015 · checked against its sources 2026-10-20 (automated, 2 of 2 entries) · not reviewed by a person

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? In the morning, sleep behavior dimensions accounted for 8% of children's daily working memory performance fluctuations, with time in bed and sleep quality reliably predicting performance over and above daily trends. → Könen 2015 q3 i? Time in bed showed a significant positive linear and negative quadratic fixed effect on morning performance, an asymmetric inverted-U relationship in which performance after too little and after too much sleep was lowered. → Könen 2015 (2)

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

Multilevel two-level models (N = 110, average about 22–24 occasions per child) predicting daily working memory updating from sleep quality, tiredness, and time in bed, controlling individual daily trends. Sleep-related predictors explained 8% of morning performance fluctuations.

"In the morning, all the dimensions of sleep behavior accounted for 8% of the children's daily performance fluctuations. Time in bed and sleep quality reliably predicted performance over and above daily trends."

Könen 2015 (2)¶

q3 · i? · associational · r2

Multilevel analysis of morning working memory updating as a function of the previous night's time in bed, plotted in Figure 2 centered at the person mean. The relationship was robust to outliers when tested within the 2.5 and 97.5 percentiles of the time in bed data.

"Time in bed had a signiﬁcant positive linear and a negative quadratic ﬁxed effect, which indicates an asymmetric inver- ted-U shaped relationship (Figure 2). Performance after too little and after too much sleep was lowered."

Discussion¶

Sleep education at school improves cognitive functioning in children — related
Elementary school children show substantial day-to-day within-person fluctuations in sleep quality, time in bed, daytime tiredness, and working memory performance — a broader claim this one bears on
Children with lower average working memory performance show stronger within-person coupling between nightly sleep quality and morning performance — a narrower finding that bears on this claim
Current daytime tiredness predicts children's afternoon working memory performance fluctuations — related
Elementary school children show substantial within-person day-to-day fluctuations in working memory performance in the school context — related

Page metadata

Field	Value
`type`	`claim`
`id`	`sleep-quality-time-in-bed-predict-morning-working-memory`
`title`	`Previous night's sleep quality and time in bed predict children's morning working memory performance fluctuations`
`description`	`Previous night's sleep quality and time in bed predict children's morning working memory performance fluctuations`
`status`	`review`
`evidence_strength`	`moderate`
`newest_evidence`	`2015`
`source_checked`	`2026-10-20`
`generated`	by `process:wiki-ingest` on `2026-10-16`
`trust`	unverified — no one has confirmed this page's content
`sources`	2 — `könen-2015`, `könen-2015-2`

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