01 Acceptance of Terms

These Terms of Use (“Terms”) form a legally binding agreement between you (“User”, “you”, “your”) and SmartSleepCalc (“we”, “us”, “our”), the operator of smartsleepcalc.com and all associated subpages, tools, and content.

By accessing, browsing, or using any part of this website — including any sleep calculator tool, article, or downloadable resource — you acknowledge that you have read and agree to these Terms in full. If you are under 13 years of age, you may not use this website. Users aged 13–17 must have parental or guardian consent.

02 Services Description

SmartSleepCalc.com provides free, browser-based sleep science tools and educational content. Our current services include:

• Sleep & Bedtime Calculator — optimal bedtimes based on 90-minute sleep cycle research (Kleitman & Aserinsky 1953; NSF 2025)
• Nap Calculator — full-cycle and power nap timing based on Rosekind et al. 1995 and Reyner & Horne 1997
• Sleep Debt Calculator — cumulative sleep deficit tracking against NSF guidelines
• REM Cycle Calculator — NREM/REM stage distribution based on AASM staging guidelines
• Sleep Schedule Builder — schedule planning based on chronotype and Borbely two-process model
• Educational articles on sleep science, health, and wellness — all statistics cited to primary sources

All tools operate entirely within your browser. We do not store your input data on our servers. We reserve the right to add, modify, or discontinue any service at any time without prior notice.

This site is supported by Google AdSense advertising revenue and Amazon Associates affiliate commissions. These revenue sources help us provide all tools and content free of charge.

03 Medical & Educational Disclaimer

SmartSleepCalc.com is not a medical service and has not been reviewed by a licensed medical professional. All sleep calculations and educational content are based on publicly available peer-reviewed sleep science research — including AASM 2016 guidelines, NSF 2025 recommendations, and the sleep cycle model from Kleitman & Aserinsky 1953.

This information is provided for general informational and educational purposes only. It does not constitute:

• Medical advice, diagnosis, or treatment recommendations
• A substitute for professional medical consultation
• A personalised health plan tailored to your individual circumstances
• Clinical guidance for sleep disorders such as insomnia, sleep apnoea, or narcolepsy

Individual sleep needs vary based on age, health status, medications, lifestyle, and genetics. Our tools calculate results based on population averages and may not be appropriate for every individual. See the full Medical Disclaimer →

04 Permitted Use

We grant you a limited, non-exclusive, non-transferable, revocable licence to access and use SmartSleepCalc.com for personal, non-commercial purposes only.

• Use all calculator tools freely for personal sleep planning
• Read and share links to our educational articles
• Print calculator results or article excerpts for personal reference
• Embed a link to our tools on your personal blog or website with attribution
• Cite our content in academic or personal writing with a proper source link

05 Prohibited Use

You may not use this website to:

• Copy, reproduce, republish, or redistribute our tools, code, or content commercially without written permission
• Scrape, crawl, or automatically harvest data from our website without prior written consent
• Attempt to reverse-engineer, decompile, or extract source code from our calculator tools
• Introduce malware, viruses, or any harmful code to our systems
• Use our website in any way that violates applicable local, national, or international laws
• Impersonate SmartSleepCalc, its operator, or any other person or entity
• Use our content to build a competing service without explicit written permission
• Attempt to gain unauthorised access to any part of our website or servers
• Frame or mirror any portion of our website on another site without consent
• Click on advertisements displayed on this site artificially, fraudulently, or repeatedly — this violates Google AdSense programme policies and may result in your IP being reported to Google

06 Intellectual Property

All content on SmartSleepCalc.com — including but not limited to calculator tools, JavaScript code, HTML/CSS design, written articles, graphics, logos, schema markup, and user interface elements — is the intellectual property of SmartSleepCalc (operated by Muzammal Shahzad Butt) and is protected by applicable copyright, trademark, and intellectual property laws.

Unauthorised reproduction, distribution, or commercial use of any part of this website is strictly prohibited and may result in legal action.

07 Accuracy of Information

We make every effort to ensure that all sleep calculations and educational content on this website are accurate, current, and based on credible published sleep science research. All content is researched and fact-checked by the site author, Muzammal Shahzad Butt (Sleep Research Editor & Tool Developer), against primary peer-reviewed sources. This site has not been reviewed by a licensed medical professional.

Our accuracy standards include:

• Every factual statistic is traced to a verifiable primary source (PubMed-indexed journal, NSF, AASM, WHO, CDC) and cited inline
• No statistic is published if it cannot be confirmed from a primary source — secondary health websites are never used as sources
• When errors are found — including statistics that misrepresent their original source — they are corrected and logged publicly in the corrections table on the About page
• Content is reviewed on a defined schedule (6 months for information pages; immediately on guideline update)

However, we do not warrant that all information is error-free, complete, or up to date at all times. Sleep science research evolves continuously. Calculator results are based on the standard 90-minute sleep cycle model and population-average sleep latency figures — your actual sleep patterns may differ. Results should be used as a starting point, not a strict prescription.

08 Disclaimer of Warranties

SmartSleepCalc.com is provided on an “as is” and “as available” basis without any warranties of any kind, either express or implied, to the fullest extent permitted by applicable law.

We specifically disclaim all warranties including:

• Merchantability and fitness for a particular purpose
• Accuracy, reliability, or completeness of any content or calculation
• Uninterrupted, timely, secure, or error-free operation of the website
• That results from our tools will be suitable for your individual health needs
• That the website is free from viruses or other harmful components
• That advertisements displayed on this site are endorsed or verified by us

09 Limitation of Liability

To the maximum extent permitted by applicable law, SmartSleepCalc and its operator, contributors, and affiliates shall not be liable for any direct, indirect, incidental, special, consequential, or punitive damages arising from:

• Your use of or inability to use this website or its tools
• Any health outcomes resulting from following calculator results or content
• Errors, inaccuracies, or omissions in content or calculations
• Interruption, suspension, or discontinuation of the website or any service
• Unauthorised access to or alteration of your data or transmissions
• Any third-party content, websites, or services linked from this website
• Any purchases made via Amazon affiliate links or products advertised via Google AdSense

Our total aggregate liability to you for any claims arising from use of this website shall not exceed $100 USD, regardless of the cause of action.

10 Indemnification

You agree to defend, indemnify, and hold harmless SmartSleepCalc, its operator, contributors, and affiliates from and against any claims, liabilities, damages, losses, costs, and expenses (including reasonable legal fees) arising from:

• Your use of or access to this website
• Your violation of any provision of these Terms
• Your violation of any third-party rights, including intellectual property rights
• Any content you submit or share in connection with this website

11 Privacy & Cookies

Your privacy is important to us. Our full Privacy Policy describes how we collect, use, and protect your information and is incorporated into these Terms by reference.

• No calculator data collected: Our tools run entirely in your browser. We do not collect, store, or transmit any sleep data you enter
• Analytics: We use privacy-respecting aggregated analytics to improve our tools
• Advertising cookies: Google AdSense places third-party cookies on your device. Opt out at adssettings.google.com
• Affiliate cookies: Amazon may set tracking cookies when you click affiliate links from this site
• No account required: No sign-up is needed for any tool on this website
• No data selling: We do not sell or share your personal data for marketing purposes

12 Google AdSense & Advertising

This website participates in the Google AdSense programme, operated by Google LLC. Google AdSense allows us to display advertisements on our pages, which helps fund the free tools and content we provide.

• Google uses cookies and similar technologies to serve ads based on your prior visits to this and other websites
• We do not control which specific ads are shown — ad selection is handled by Google’s automated systems
• We do not pass any personally identifiable information to Google through AdSense
• Ad content on this site is entirely separate from our editorial content — advertising has no influence on the information or tool results we publish

13 Amazon Affiliate Disclosure

Some pages on this website contain affiliate links to products on Amazon. When you click one of these links and make a qualifying purchase, we may earn a small commission — at no additional cost to you.

• “(paid link)” or “#ad” placed adjacent to individual product links
• A disclosure notice at the top of any article or page containing affiliate links
• This Terms of Use page and our Privacy Policy

Affiliate relationships do not influence our editorial content, health information, tool formulas, or source choices. Our sleep science content is written and fact-checked independently of any commercial considerations.

14 Third-Party Links

SmartSleepCalc.com may contain links to third-party websites, research studies, and organisations for informational purposes. These links are provided as a convenience only. We do not endorse, control, or assume responsibility for the content, privacy practices, or accuracy of any third-party website.

Some pages contain Amazon affiliate links, clearly identified per FTC guidelines (see Section 13). Clicking affiliate links and making purchases helps support the free tools on this site at no extra cost to you.

15 Changes to These Terms

We reserve the right to update or modify these Terms at any time. When we make material changes, we will update the “Last Updated” date at the top of this page. Your continued use of SmartSleepCalc.com after any changes are posted constitutes your acceptance of the revised Terms.

16 Governing Law & Disputes

These Terms shall be governed by and construed in accordance with applicable law. Any disputes arising from your use of this website shall first be attempted to be resolved through good-faith negotiation. If a resolution cannot be reached informally within 30 days, disputes may be submitted to binding arbitration or the relevant courts of jurisdiction.

If any provision of these Terms is found to be invalid or unenforceable, the remaining provisions shall continue in full force and effect.

17 Contact Us

If you have any questions, concerns, or requests regarding these Terms of Use — including questions about our advertising, affiliate relationships, or content accuracy standards — please contact us:

Note: We cannot provide medical advice via email or contact form. For health concerns, please consult a qualified healthcare provider.