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¶
Claim · All claims
Evidence · 1 study · causalr2·q3
Currency · newest study 2019 · not yet checked against its sources · not reviewed by a person
Subclaims¶
Reading the evidence codes
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This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? Polysomnography showed 24-hour total sleep time was consistently lower under the split schedule and REM sleep duration was significantly reduced on learning days (M = 64.0 vs 75.36 min). → 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 · i? · causal · r2
Polysomnography averaged over two recorded nights (SR21, SR23) of the second restriction week: "TST was again significantly lower in the split sleep group" (about 12 min less) and "REM sleep duration was significantly reduced by splitting sleep" (64.0 vs 75.36 min, t(53) = 2.697, p = 0.009). Memory did not correlate with any sleep metric.
"TST was again significantly lower in the split sleep group (split sleep: M = 354.71 ± 9.57 min; continuous sleep: M = 366.69 ± 9.41 min), t(53) = 4.682, p < 0.001. Analysis of macrostructure showed that REM sleep duration was significantly reduced by splitting sleep"
Discussion¶
Learner Variables¶
- Sleep — outcome: instruction changes it
Related Claims¶
- Splitting sleep with an afternoon nap does not impair morning learning in sleep-restricted adolescents despite reduced nocturnal sleep — 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
- 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 — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
split-sleep-reduces-total-and-rem-sleep |
title |
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 |
description |
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 |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2019 |
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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