About Smart Sleep Calculator
We build free, evidence-based sleep science tools and guides for everyone. Our mission is simple: help you understand your sleep, find your ideal schedule, and wake up genuinely rested — backed by research, not guesswork.
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Our Mission
At Smart Sleep Calculator, we believe most people sleep worse than they need to — not because of disease, but because of a lack of clear, actionable information. The science of sleep is well-established. The problem is that it is locked behind academic journals, oversimplified by wellness content, or buried under product sales pitches.
Our mission is to bridge that gap. We translate peer-reviewed sleep research into practical tools and plain-language guides that anyone can use, for free, without needing a background in biology or medicine.
Our recommendations follow guidelines from trusted organisations including the National Sleep Foundation and the CDC — including the evidence-based recommendation of 7 to 9 hours of sleep per night for most adults.
Research first
Every tool and guide is built on peer-reviewed sleep science. We cite researchers by name and link to primary sources wherever possible.
Plain language, zero jargon
We explain ultradian rhythms and nocturnal dips in terms anyone can understand — without losing clinical accuracy.
Free, forever
All calculators and guides are free. We are supported by clearly disclosed affiliate links, never by selling advice or hiding content behind paywalls.
Honest about limits
We are not a medical service. We are clear about what our tools can and cannot do, and when you should see a doctor.
📝 Our Editorial Process
Every calculator and guide on SmartSleepCalc.com follows a documented, repeatable process from first draft to publication — and continues to be maintained after it goes live. This page explains exactly how that process works.
Calculator formula sourcing
Every calculator is built from named clinical guidelines. Sleep cycle timing follows Kleitman’s 90-minute ultradian rhythm research. Duration recommendations apply NSF’s 2015 age-stratified consensus panel guidelines. Nap timing uses NASA’s 1995 fatigue countermeasures study. Formula logic is version-controlled and documented internally before any front-end build begins.
Content writing standards
All health-adjacent content is written from primary research sources — PubMed-indexed journals, clinical guideline documents, and institutional publications. We do not accept AI-generated content as a final draft. AI tools may assist with structure and formatting only; every health claim, statistic, and recommendation is verified by a human editor against the original cited source before publication.
Dr. Mitchell’s review checklist
Before any YMYL page is published, Dr. Sarah Mitchell (CCSH) reviews it for: (a) clinical accuracy of all health claims, (b) correct interpretation of cited research, (c) appropriate medical disclaimers present above the fold, (d) “when to see a doctor” thresholds that are specific and evidence-based, and (e) no overpromising of what a sleep calculator can diagnose or confirm.
Disclaimer compliance
All health pages carry the statement: “SmartSleepCalc.com provides educational information only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.” This appears above the fold on every YMYL page and is reviewed at each update cycle.
Content Review Schedule
| Content Type | Review Cycle | Triggered By | Status |
|---|---|---|---|
| YMYL health pages (sleep disorder screening, EDS, etc.) | Every 12 months | Scheduled + guideline updates | Active |
| Calculator logic and formulas | On guideline change | NSF, AASM, AAP updates | Active |
| General sleep science guides | Every 18 months | Scheduled | Active |
| User-reported error corrections | Within 5 business days | Contact form submission | On request |
📋 Our Sources and Research Standards
Accuracy begins with source quality. We apply a consistent hierarchy of evidence to every page we publish — the same standard used in clinical practice guidelines.
Why peer-reviewed journals first
Secondary health websites, press releases, and wellness blogs are not acceptable primary sources for health claims on this site. We require every non-trivial health claim to trace back to a PubMed-indexed journal article, a named institutional guideline document, or a peer-reviewed textbook. This standard prevents the citation chain common in health content — where Blog A cites Blog B, which misquotes a 2009 study.
Organisations we reference
Our content draws on guidelines and consensus statements from: the National Sleep Foundation (NSF), the American Academy of Sleep Medicine (AASM), the American Academy of Pediatrics (AAP), the World Health Organization (WHO), and the CDC. We link directly to the source document, not to a summary page.
Handling conflicting evidence
Sleep science contains genuine areas of ongoing debate — optimal sleep duration for longevity, napping and cardiovascular risk, and chronotype variability are all areas where high-quality studies sometimes disagree. When credible studies conflict, we present the range of evidence, state clearly that consensus has not been reached, and apply the most conservative clinical recommendation from the most authoritative guideline body available.
Policy on preliminary research
We do not present preliminary, non-peer-reviewed, or preprint research as established fact. Emerging findings may be referenced as context — always labelled explicitly as “preliminary,” “early-stage,” or “not yet replicated” — and are never used as the sole basis for a calculator recommendation or health guidance statement.
👤 Meet the Reviewer — Dr. Sarah Mitchell, CCSH
All health-adjacent and YMYL content on SmartSleepCalc.com is reviewed by a credentialled sleep health professional before publication. Here is her full background, what her credential means, and how to verify it independently.
“Most people who struggle with sleep are not dealing with a medical condition — they are dealing with a knowledge gap. When I first started reviewing content for SmartSleepCalc.com, I was struck by how carefully the tools were built from actual clinical guidelines rather than wellness generalisations. That rigour is exactly what separates genuinely helpful sleep education from the noise. My job is to make sure it stays that way.”— Dr. Sarah Mitchell, CCSH, Content Reviewer, SmartSleepCalc.com
Our Sleep Health Expert
✓ CCSH CertifiedDr. Sarah Mitchell
CCSH — Clinical Sleep Health Professional
Dr. Sarah Mitchell holds the CCSH (Certification in Clinical Sleep Health) credential, which recognises professionals trained in sleep health education, sleep disorder screening, and patient-centred sleep coaching. Her 12 years in behavioural sleep medicine — with a primary specialisation in CBT-I — inform her review of every YMYL page on this site.
Her approach combines behavioural strategies with clear education — so people can feel more rested, productive, and confident managing their own sleep, free from medical jargon and unsupported wellness claims.
Our Core Values
These six principles guide every tool we build, every article we publish, and every editorial decision we make.
Science-Driven
All tools and recommendations are grounded in peer-reviewed research and guidelines from the NSF and CDC. We name our sources and update when evidence changes.
Accessibility
Sleep tools are free to use for everyone, on any device, with no account required. Complex science is explained in plain language without losing accuracy.
Privacy-First
Our calculators run entirely in your browser. We do not collect, store, or sell personal sleep data. See our Privacy Policy for full details.
Transparent Uncertainty
Where research is limited or emerging, we say so clearly. We do not present preliminary findings as established fact or overpromise what a sleep calculator can do.
Regularly Updated
Sleep science evolves. All YMYL health pages are reviewed at least annually, and triggered reviews happen whenever major guidelines are updated.
Honest Monetisation
This site uses clearly disclosed affiliate links. Affiliate relationships never influence our editorial recommendations or calculator accuracy. See our Affiliate Disclosure.
How We Build Our Content
Every calculator and guide goes through a consistent process before it reaches you.
Research and source identification
Content begins with primary research literature and clinical guidelines — not secondary health blogs. Key claims are attributed to named researchers and institutions. For YMYL health topics, at least two independent sources are required per claim.
Expert review by Dr. Sarah Mitchell
Health-adjacent and YMYL content is reviewed by our CCSH-credentialled sleep health expert for clinical accuracy, appropriate caveats, and correct interpretation of the underlying research before publication.
Calculator formula testing
All calculator logic is tested against edge cases (midnight crossing, extreme age inputs, boundary conditions) and validated against published reference values. Formulas are documented and version-controlled.
Plain language and medical disclaimer review
Content is reviewed to ensure clinical accuracy is preserved in plain language. YMYL pages are checked for above-fold disclaimers, specific “when to see a doctor” thresholds, and accurate medical caveat language.
Scheduled reviews and updates
Published content is reviewed on a schedule (annually for YMYL, 18 months for general content) and immediately when new clinical guidelines are issued or user reports identify a potential error.
Trusted Sources We Use
We do not reference unverified health articles or press releases as evidence. Our content draws on these primary source types.
National Sleep Foundation
Age-stratified sleep duration guidelines. Applied in all calculators and duration guides. sleepfoundation.org
CDC Sleep Resources
Public health recommendations for adults: 7 or more hours per night. cdc.gov/sleep
Peer-reviewed research
Primary studies from PubMed-indexed journals. Key researchers cited: Kleitman, Van Cauter, Kraeuchi, Parmeggiani.
AASM Clinical Guidelines
American Academy of Sleep Medicine clinical standards for sleep disorder diagnosis and treatment thresholds. aasm.org
Foundational textbooks
Principles and Practice of Sleep Medicine and equivalent texts for established physiological mechanisms.
Named researcher citation
Non-obvious health claims cite the specific study, author, and year — not just a general “studies show” statement.
⚠ Medical Disclaimer
SmartSleepCalc.com provides educational information only and is not a substitute for professional medical advice, diagnosis, or treatment. If you have concerns about your sleep or health, please consult a qualified healthcare professional. Our tools produce estimates based on population averages — individual sleep cycles range from 70 to 120 minutes.
💵 Affiliate Disclosure
Some pages on Smart Sleep Calculator contain affiliate links. If you purchase a product through one of these links, we may earn a small commission at no additional cost to you. Affiliate relationships never influence our editorial recommendations, content accuracy, or calculator logic. All affiliate relationships are disclosed clearly on relevant pages and in our Affiliate Disclosure.
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Start with our most popular tool — the Sleep Cycle Calculator. Find your ideal bedtime or wake-up time in under 30 seconds.