Medical Review Policy
Smart Sleep Calculator is committed to providing accurate, evidence-based sleep science information. This page explains how our content is written, reviewed, and kept up to date — and what we do and do not claim to provide.
Our Editorial Commitment
Smart Sleep Calculator exists to provide free, reliable sleep science tools and educational content. We operate in the YMYL (Your Money or Your Life) category — sleep health intersects with cardiovascular health, mental health, metabolic health, and overall wellbeing. We take this responsibility seriously. Our commitment is to accuracy, transparency, and honest communication of both what the science shows and where evidence is limited or uncertain.
Evidence-Based
All health claims reference peer-reviewed research or established clinical guidelines. We cite sources and name researchers where relevant.
Transparent Uncertainty
Where evidence is limited, preliminary, or contested, we say so explicitly. We do not present emerging research as established fact.
Regularly Updated
Sleep science research continues to evolve. Content is reviewed and updated when new evidence materially changes our recommendations.
What We Cover and How We Classify It
Not all content on this site carries the same health sensitivity. We apply different editorial standards based on the nature of the content — general sleep education, calculator tools, and medically sensitive topics each receive appropriate treatment.
Category A
Sleep Timing Tools
- Sleep cycle calculators
- Bedtime and wake-up calculators
- Nap duration calculators
- Jet lag calculators
These tools use established sleep science (NSF guidelines, Kleitman ultradian rhythm research). Calculations are based on population averages with clear individual variation notes.
Category B
Sleep Science Education
- Sleep stage descriptions (N1, N2, N3, REM)
- Circadian rhythm physiology
- Sleep deprivation effects
- Sleep hygiene recommendations
Educational content is based on mainstream sleep science consensus. We reference primary research and named researchers. Age-appropriate sleep recommendations follow National Sleep Foundation (NSF) guidelines.
Category C
Health-Adjacent Topics
- Sleep and exercise
- Body temperature during sleep
- Napping after exercise
- Sleep and recovery
Topics where sleep intersects with physical health. Content cites specific researchers (e.g. Van Cauter on GH, Kraeuchi on thermoregulation) and distinguishes well-established findings from emerging evidence.
Category D — YMYL
Medically Sensitive Topics
- Heart rate during sleep
- Cardiovascular risk markers (nocturnal dip)
- Fever and sleep
- When to see a doctor callouts
These pages carry prominent medical disclaimers, include specific “speak to your doctor if…” callouts, and are held to the highest accuracy standard. Data ranges cite clinical sources and flag individual variation explicitly.
YMYL Content Standard
Pages covering cardiovascular markers (heart rate nocturnal dip, non-dipper cardiovascular risk) are treated as medical information under Google’s YMYL guidelines. These pages include: accurate clinical data ranges with named sources, explicit “consult your doctor” sections for concerning readings, clear statements that our tools and content do not replace medical evaluation, and medical disclaimer notices visible on the page itself — not buried in footers only.
Content Creation and Review Process
Every page on Smart Sleep Calculator goes through a defined creation and review process before publication. The steps below apply to all substantive content pages — not placeholder or utility pages.
Research and source identification
Content is drafted with reference to primary research literature, clinical guidelines, and established textbook-level sleep science. Key findings are attributed to named researchers and institutions. For YMYL pages, at least two independent sources are required for each health claim.
Accuracy review of numerical data
All numerical claims — heart rate ranges, temperature values, sleep duration recommendations, percentage figures — are individually verified against cited sources before publication. Calculator formulas are tested against edge cases (midnight crossing, extreme inputs, age group boundary conditions) and validated against known reference values.
Medical flagging and disclaimer placement
Before publication, every Category D (YMYL) page is checked for: presence of a “when to see your doctor” section with specific measurable thresholds, a medical disclaimer note visible above the fold or within the first scroll, and accurate medical caveat language that does not overstate or understate clinical significance.
Plain language review
Sleep science content is reviewed to ensure clinical accuracy is preserved while remaining accessible to a general adult audience. We do not simplify in ways that distort meaning. Where technical terms are necessary (e.g. poikilothermia, nocturnal dip, HRV), they are defined in plain language on the same page.
Publication and monitoring
Published pages are monitored for user feedback indicating factual errors, confusing guidance, or outdated information. Pages are queued for review when: new clinical guidelines are issued, major research changes the evidence base, or user feedback identifies a potential accuracy issue.
Sources and References We Use
Our content draws on a defined set of high-quality sources. We do not reference tabloid health articles, unverified anecdotal reports, or press releases as evidence for clinical claims. The source types below, in descending order of weight, inform our content.
Peer-reviewed research
Primary sleep research published in indexed journals. We reference the specific study and author(s) by name where claims are non-obvious or clinically significant.
Clinical guidelines
National Sleep Foundation (NSF), American Academy of Sleep Medicine (AASM), and equivalent international bodies for sleep duration recommendations and clinical thresholds.
Established textbooks
Foundational sleep science textbooks (e.g. Principles and Practice of Sleep Medicine) for non-contested physiological facts and mechanism descriptions.
Key researchers cited on this site
Content Update Policy
Sleep science is an active research field. Our update policy ensures content reflects current evidence rather than remaining static after publication.
Scheduled reviews
All Category D (YMYL) pages are reviewed at least annually. Category B and C pages are reviewed every 18 months or when related guidelines are updated.
Triggered reviews
Immediate review is triggered by: new NSF or AASM guideline publications, major meta-analyses that contradict existing content, or user reports of factual error.
Update transparency
Updated pages show a “Last reviewed” date. Substantive changes to health claims include a brief change note explaining what was updated and why.
Medical Disclaimer
⚠ Important — Please Read
Smart Sleep Calculator provides sleep science information and calculation tools for general educational purposes. The content on this website, including all articles, calculators, guides, and data ranges, does not constitute medical advice and must not be used as a substitute for professional medical evaluation, diagnosis, or treatment.
- Sleep disorders, including insomnia, sleep apnoea, circadian rhythm disorders, and parasomnias, require diagnosis and management by a qualified healthcare professional.
- Heart rate data shown on this site represents population-level averages and normal ranges. Individual readings outside these ranges may be normal for you — or may require medical evaluation. Only a doctor can determine which applies to your situation.
- If you experience symptoms including chest pain, breathlessness, palpitations, excessive daytime sleepiness, or witnessed apnoea, seek medical advice promptly. Do not use this website in place of doing so.
- Calculator outputs are estimates based on population averages. Individual sleep cycle length varies from 70 to 120 minutes. Treat calculator results as a starting point, not a prescription.
- Nothing on this website creates a patient-provider relationship between Smart Sleep Calculator and any reader.
Found an error or have a question about our editorial process? We take accuracy reports seriously. Contact us and we will review within 5 business days.
Contact Us →