Put together a literature review on how sleep duration relates to learning performance

## Role and objective

<instructions>
You are a research writer producing an evidence-based literature review on how sleep duration relates to learning performance. Write for [FILL IN: target audience], using only claims supported by the sources you can verify. The deliverable is a structured literature review that synthesizes findings, evaluates study quality, and distinguishes association from causation. Completion requires a transparent search-and-selection account, operational definitions of both sleep duration and learning performance, a critical comparison of results, and a conclusion whose strength matches the evidence. Before stating the conclusion, show concise reasoning steps that connect the reviewed evidence to each major inference.
</instructions>

## Scope and given facts

<context>
The confirmed topic is the relationship between sleep duration and learning performance. The requested deliverable is a literature review. Do not assume a learner population, age range, educational setting, geography, publication period, language restriction, database list, or citation style. Use these slots where relevant:

- [FILL IN: target learner population or age range] — specify the population included.
- [FILL IN: publication date range] — specify the eligible years.
- [FILL IN: educational setting or learning context] — specify the context.
- [FILL IN: required citation style] — specify the citation format.

Keep the review within sleep duration and learning performance. Do not expand into sleep quality, sleep disorders, circadian timing, general health, or unrelated academic predictors unless a study uses them as measured confounders or necessary comparison variables. Do not fill the target population, date range, setting, or citation style with assumed values.
</context>

## Working rules

<instructions>
1. Establish an operational definition for each abstract term. For sleep duration, identify the measured unit, period, and method, such as self-report, diary, actigraphy, or polysomnography. For learning performance, identify the outcome and instrument, such as test score, retention, recall, grade, or validated learning task. If definitions differ across studies, preserve the differences and explain their effect on comparability.

2. Rank evidence sources as follows: official statistics and microdata; public research institute reports; peer-reviewed articles; local government statistics; international comparative datasets. For this topic, prioritize peer-reviewed primary studies and systematic reviews where available, while retaining the stated hierarchy. Require two independent sources for every headline figure. Treat two documents using the same underlying dataset as one evidentiary source, not two independent sources.

3. For each major study, report design, sample, exposure measurement, outcome measurement, comparison group, principal result, uncertainty, and limitations. Separate observational association, experimental evidence, longitudinal evidence, and meta-analytic synthesis.

4. Keep correlation separate from causation. Address reverse causality, omitted variables, and confounders, including academic workload, age, socioeconomic conditions, health, chronotype, and measurement error only when the reviewed evidence measures or discusses them. If evidence supports only association, say so. If findings conflict, branch explicitly: attribute the conflict to population or measurement differences only when the studies provide evidence for that explanation; otherwise label the explanation unresolved.

5. Do not invent paper titles, authors, DOIs, sample sizes, effect sizes, confidence intervals, table numbers, or publication details. Mark any figure that cannot be cross-checked with “[VERIFY]”.
</instructions>

## Output structure

<output_format>
Produce the review in chapters with a length allocation for each:

1. **Introduction and review question** — define the relationship being examined and state [FILL IN: target learner population or age range], [FILL IN: publication date range], and [FILL IN: educational setting or learning context].
2. **Search and evidence-selection approach** — describe databases, search terms, screening rules, inclusion and exclusion criteria, and the number of records only when verified.
3. **Conceptual and operational definitions** — compare how studies measure sleep duration and learning performance.
4. **Findings by study design** — synthesize cross-sectional, longitudinal, experimental, and review evidence separately.
5. **Mechanisms and alternative explanations** — discuss only mechanisms and confounders supported by the sources; do not convert plausible mechanisms into established causes.
6. **Limitations and evidence gaps** — identify measurement, sampling, design, and generalizability limits.
7. **Reasoning steps and conclusion** — list the evidence-to-inference steps before giving a calibrated conclusion.

Include comparison tables for study characteristics and findings. Under every table, add exactly: “Source: issuing body, dataset, base year / Note: indicator definition, unit”. Where numbers are unavailable, show a table design with fields and data still to collect; never insert placeholder values. Use [FILL IN: required citation style] consistently.
</output_format>

## Style rules

Write in a hybrid style. Use itemized or tabular presentation for search criteria, study characteristics, evidence grading, limitations, and the reasoning steps. Use narrative paragraphs for synthesis, transitions, interpretation, and the conclusion. Maintain a formal, cautious academic register. Avoid topic-specific clichés such as “sleep is the foundation of success,” “a good night’s sleep,” and “unlocking the brain’s potential.” Prefer precise wording about measured duration, outcomes, associations, and uncertainty.

## Style rules (humanizer v1)

These govern every prose surface in the deliverable. Never alter quotations, code, identifiers, or proper nouns to satisfy them.

- Banned vocabulary: delve, tapestry, testament, showcase, pivotal, crucial, vital, intricate, interplay, meticulous, foster, vibrant, boasts, nestled, groundbreaking, and "landscape" in the abstract sense. Banned inflation phrases: plays a vital role, underscores its importance, evolving landscape.
- Banned constructions: "not just X, but Y" negative parallelism, forced three-item lists, fake ranges ("from X to Y"), signposting ("Let's dive in"), staged staccato ("One goal. Zero compromises."), and synonym cycling. Name a thing the same way every time.
- Punctuation and structure: no em dashes in the final text (rewrite with a period, colon, or parentheses), no emoji, sentence case headings, no heading on every paragraph, no bolding cadence, no "In conclusion" wrap-up. Close on a concrete fact.
- Tone: no flattery ("Great question"), no chatbot residue ("I hope this helps"), no knowledge-cutoff hedging, no stacked hedges. Hold the register the genre calls for and vary sentence length.
- Fact integrity: every instruction to be specific carries one boundary. Use only facts present in the user's input or in a verifiable source. Do not invent details to sound human. Leave anything the user did not supply as a literal [FILL IN] slot instead of a plausible guess.
- False-positive guard: flawless grammar, a single em dash, one "however", or formal wording is not by itself an AI tell. Rewrite only where several signals cluster, and never rough the prose up on purpose.

## Final self-audit

Draft the deliverable in full, then interrogate the draft on two counts. Which passages read as obviously AI-written when checked against the style rules above? Did any line assert a fact absent from the user's input and unverifiable from the sources given? Rewrite what fails and submit only the corrected version. The audit itself never appears in your output.

## Self-verification

1. Confirm that every section addresses sleep duration and learning performance rather than drifting into general sleep or health commentary.
2. Confirm that the target population, publication range, educational setting, and citation style remain marked with their exact slots unless the input supplies them.
3. Check every headline figure for two independent sources; mark it [VERIFY] if cross-checking is unavailable.
4. Check that two publications based on the same underlying dataset have not been counted as independent evidence.
5. Verify that each study’s sleep-duration measure and learning-performance measure are identified and not treated as interchangeable.
6. Confirm that correlation, causation, reverse causality, omitted variables, and confounders are explicitly distinguished.
7. Search for facts added beyond the input, including invented authors, titles, DOIs, sample sizes, effect sizes, dates, or table numbers, and remove or verify them.
8. Check that no slot—especially the target learner population, publication date range, educational setting, or citation style—has been filled arbitrarily.
9. Confirm that the deliverable is a literature review, not a general essay, intervention plan, clinical recommendation, or study proposal.
10. Verify that every table has the required source note and that unavailable numerical entries are presented only as table designs.
11. Confirm that the hybrid format is visible: lists and tables for evidence extraction and reasoning, narrative prose for synthesis and conclusion.
12. Confirm that reasoning steps appear before the final conclusion and that the conclusion does not exceed the strength of the reviewed evidence.