Last updated: June 2025
Pillow Time (pillowtime.fyi) is a free sleep calculator tool operated by Calaweb, a sole trader web design and development business based in the United Kingdom. By using this site you agree to these terms. If you do not agree, please do not use the site.
The sleep timing calculations and guidance provided on this site are based on generally accepted scientific understanding of sleep cycles, circadian rhythms, and sleep health. The 90-minute sleep cycle model, REM sleep distribution, and nap duration guidance are drawn from established research in sleep science.
However, sleep is a personal and highly individual experience. Cycle lengths vary between people and can vary for the same person from night to night depending on age, health, stress, diet, medication, and many other factors. The times and durations this site suggests are starting points, not prescriptions. They work well for many people and may need adjustment for you.
Nothing on this site constitutes medical advice. If you have concerns about your sleep, experience persistent difficulty sleeping, or have a condition that affects your sleep, please consult a qualified medical professional.
Calaweb provides this site and its calculators in good faith and free of charge. We make no warranty, express or implied, as to the accuracy, completeness, or suitability of the information provided for any particular purpose.
We accept no responsibility for any outcome, loss, or harm arising from your use of the calculations or guidance on this site. This includes but is not limited to missed alarms, tiredness, impaired performance, or any effect on health or wellbeing. You use this site entirely at your own risk and remain responsible for your own sleep decisions.
This site displays adverts served by Google AdSense. These adverts are provided by Google and its advertising partners and are not endorsed or controlled by Calaweb. We are not responsible for the content of any advert displayed on this site. For information about how Google uses data in connection with advertising, please see our Privacy Policy.
All content on this site, including text, design, layout, and code, is the property of Calaweb unless otherwise stated. You may share links to this site and quote short passages for non-commercial purposes provided you attribute pillowtime.fyi as the source. You may not reproduce substantial portions of this site's content, scrape it systematically, or use it for commercial purposes without our prior written permission.
This site may contain links to external websites. These are provided for your convenience and information only. Calaweb has no control over the content of external sites and accepts no responsibility for them or for any loss or damage that may arise from your use of them.
We may update these terms from time to time. When we do, we will update the date at the top of this page. Continued use of the site following any changes constitutes your acceptance of the updated terms.
These terms are governed by the laws of England and Wales. Any disputes arising from your use of this site will be subject to the exclusive jurisdiction of the courts of England and Wales.
If you have any questions about these terms, please contact us at privacy@calaweb.co.uk.