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 poikilothermia, 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 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 work focuses on helping individuals and families understand their sleep patterns, build healthier routines, and translate sleep science into everyday habits.
Her approach combines behavioural strategies with clear education — so people can feel more rested, productive, and confident managing their own sleep. She is committed to making sleep knowledge accessible and practical, 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.
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
Smart Sleep Calculator provides sleep science information and tools for general educational purposes only. Nothing on this site constitutes 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.
Ready to improve your sleep?
Start with our most popular tool — the Sleep Cycle Calculator. Find your ideal bedtime or wake-up time in under 30 seconds.