Privacy & Cookie Policy

Who we are

Sleep Calculator ("we", "us", "the site") operates the website at bestbedtimecalc.com. The site is a free online tool that estimates bedtimes and wake-up times based on average 90-minute sleep cycles. You can contact us at any time through our contact page.

Information we collect

The calculator itself runs entirely in your browser. The times you enter are processed on your own device and are not sent to or stored on our servers. We do not require you to create an account, and we do not ask for your name, email, or any personal details to use the tool.

We may collect limited, non-identifying information automatically, such as the pages you visit, your approximate region, browser type, and device type, through cookies and third-party services described below. This helps us understand which pages are useful and keep the site running.

Cookies and local storage

A cookie is a small text file stored by your browser. We and our partners use cookies and similar technologies (including browser localStorage) for the following purposes:

• Essential / preference storage: We store your cookie-consent choice in your browser's localStorage so we don't show the consent banner on every visit. This stays on your device and is not shared.
• Advertising cookies: Set by Google and other advertising partners to show ads and, where permitted, personalize them and measure their performance.
• Analytics cookies: Used to count visits and understand general usage trends in aggregate.

You can accept or decline non-essential cookies using the banner shown on your first visit. You can also block or delete cookies at any time in your browser settings; the calculator will continue to work.

Third-party advertising (Google AdSense)

This site is supported by advertising. We use Google AdSense and may use other third-party ad networks to display ads.

• Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to this and other websites.
• Google's use of advertising cookies enables it and its partners to serve ads to users based on their visits to this site and/or other sites on the Internet.
• You may opt out of personalized advertising by visiting Google Ads Settings.
• You can also opt out of a third-party vendor's use of cookies for personalized advertising by visiting www.aboutads.info or youronlinechoices.eu (EU).

For more information about how Google uses data, see the Google Privacy & Terms page.

Your rights — GDPR (EU/UK) and CCPA (California)

Depending on where you live, you may have rights over your personal data:

• EU/UK (GDPR): the right to access, correct, delete, or restrict processing of your data, and to object to processing or withdraw consent. For users in the European Economic Area, the UK, and Switzerland, our advertising partners present a consent mechanism before personalized ads or non-essential cookies are used. You can change your consent at any time by clearing cookies and reloading the page.
• California (CCPA/CPRA): the right to know what personal information is collected, the right to delete it, and the right to opt out of the "sale" or "sharing" of personal information. We do not sell personal information for money. To opt out of personalized advertising (interpreted broadly as "sharing"), use the Google and industry opt-out links in the advertising section above.

To exercise any of these rights, contact us via the contact page.

Children's privacy

This site is not directed to children under 13 (or the equivalent minimum age in your country), and we do not knowingly collect personal information from them.

Health disclaimer — not medical advice

Sleep Calculator is provided for general informational and educational purposes only and does not constitute medical advice. The 90-minute sleep-cycle model is an average and varies from person to person. The bedtimes, wake-up times, nap lengths, and sleep-duration figures shown on this site are estimates and are not a diagnosis, treatment, or substitute for professional care.

Always seek the advice of a qualified physician or other healthcare provider with any questions you may have about your sleep, insomnia, or any medical condition. Never disregard professional medical advice or delay seeking it because of something you read on this site. If you think you may have a sleep disorder or a medical emergency, contact a healthcare professional immediately.

Changes to this policy

We may update this policy from time to time. Material changes will be reflected by the "Last updated" date above. Continued use of the site after changes means you accept the revised policy.