Privacy Policy
Last updated: October 7, 2026
Sleepcycletimecalculator.com ("we", "us", "our") respects your privacy. This policy explains what information we collect, how we use it, and what choices you have.
Information we collect
Calculator inputs. The sleep cycle calculator runs entirely in your browser. Wake-up times, bedtimes, and nap selections are processed locally and are not sent to our servers, stored, or associated with you.
Automatic data. When you visit this site, our hosting provider (Vercel) and any advertising partners (such as Google AdSense, when enabled) may collect standard log data including IP address, browser type, referring page, pages visited, and timestamps. This data is used for site operation, security, and aggregated analytics.
Cookies and similar technologies. We and our advertising partners may use cookies, web storage, and similar technologies to remember preferences, measure traffic, and serve relevant ads. You can disable cookies in your browser settings, though some site features may not work as expected.
How we use information
- To operate, secure, and improve the site.
- To measure aggregated traffic and usage patterns.
- To display advertising through third-party ad networks (when enabled).
Advertising
This site may display advertisements served by third-party ad networks such as Google AdSense. These networks use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads based on your visit to this and/or other sites. You can opt out of personalised advertising by visiting Google Ads Settings.
Affiliate links
Some pages contain affiliate links to sleep-related products (e.g. sleep trackers, supplements). If you click an affiliate link and make a purchase, we may earn a small commission at no extra cost to you. Affiliate partnerships do not influence our calculator results or sleep advice.
Your rights
Depending on your jurisdiction (GDPR, CCPA, PDPA Singapore, etc.), you may have rights to access, correct, or delete personal data we hold about you. Since the calculator does not store inputs, the data we hold is limited to aggregated analytics and any email you send us. To exercise these rights, contact hello@sleepcycletimecalculator.com.
Children's privacy
This site is designed for adults seeking sleep advice for themselves. We do not knowingly collect personal information from children under 13. If you believe a child has provided personal information through this site, contact us and we will delete it.
Changes to this policy
We may update this policy as the site evolves. The "Last updated" date at the top will reflect the most recent change. Material changes will be highlighted on the homepage.
Contact
Questions about this policy? Email hello@sleepcycletimecalculator.com.