Under restricted sleep, adolescents on a split sleep schedule show better late-afternoon encoding of pictures than adolescents with the same total sleep opportunity in continuous nocturnal sleep¶
Claim · All claims
Evidence · 1 study · causalr?·q3·i2medium
Currency · newest study 2019 · checked against its sources 2026-10-29 (automated, 1 of 1 entry) · 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 i2 Adolescents on a split sleep schedule (5 h nocturnal + 1.5 h nap) recognized more incidentally encoded pictures after two recovery nights than those with 6.5 h continuous nocturnal sleep, with d = 0.66. → Cousins 2019
Evidence¶
Cousins 2019¶
Cousins, J. N., van Rijn, E., Ong, J. L., Wong, K. F., & Chee, M. W. L. (2019). Does splitting sleep improve long-term memory in chronically sleep deprived adolescents? npj Science of Learning 4:8. https://doi.org/10.1038/s41539-019-0047-z
q3 · i2 · causal · r?
Controlled laboratory-classroom experiment of incidental picture encoding (building/no-building judgments) at 14:45 on day 5 of restriction, with recognition tested after two 9 h recovery nights. The article reports "A′ scores were significantly higher in the split sleep group" with t(56) = 2.505, p = 0.015, d = 0.66, and mean A′ of 0.74 versus 0.69.
"A′ scores were significantly higher in the split sleep group, t(56) = 2.505, p = 0.015, Cohen's d = 0.66 (Table 2). These findings indicate a clear afternoon encoding advantage associated with a split sleep schedule."
Discussion¶
Learner Variables¶
- Sleep — predictor: learners who differ on it differ in outcomes
- Time and Continuity — predictor: learners who differ on it differ in outcomes
Related Claims¶
- Sleep schedule interacts with time of learning on confident factual memory: the split-sleep advantage appears only for afternoon-learned material — related
- A split sleep schedule raises subjective alertness and focus in the afternoon during learning, and post-nap psychomotor vigilance, in sleep-restricted adolescents — related
- Adolescents on a split sleep schedule remember more educationally realistic factual material learned in the afternoon than peers given the same total sleep opportunity as continuous nocturnal sleep — related
- Splitting sleep with an afternoon nap does not impair morning learning in sleep-restricted adolescents despite reduced nocturnal sleep — related
- A split sleep schedule reduces 24-hour total sleep time and REM sleep duration relative to equal-duration continuous nocturnal sleep, with no consistent reduction in other sleep stages — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
split-sleep-afternoon-encoding-advantage |
title |
Under restricted sleep, adolescents on a split sleep schedule show better late-afternoon encoding of pictures than adolescents with the same total sleep opportunity in continuous nocturnal sleep |
description |
Under restricted sleep, adolescents on a split sleep schedule show better late-afternoon encoding of pictures than adolescents with the same total sleep opportunity in continuous nocturnal sleep |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2019 |
source_checked |
2026-10-29 |
generated |
by process:wiki-ingest on 2026-10-26 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — cousins-2019 |
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