# Sleep Brief

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Sleep Brief is an evidence-based sleep guide: articles on falling asleep, sleep science, supplements (graded by evidence), bedroom setup, sleep gear, habits, life situations such as shift work and jet lag, and sleep problems, plus free sleep-cycle and caffeine-cutoff calculators.

## Sitemaps

- [XML Sitemap](https://sleepbrief.com/sitemap.xml): Contains all public & indexable URLs for this website.

## Pages

- [Home](https://sleepbrief.com/): Clear sleep guides with the research linked: how to fall asleep, stay asleep and wake rested, supplements graded by evidence, and a free sleep calculator.
- [Caffeine Cutoff Calculator](https://sleepbrief.com/caffeine-calculator/): Find the latest time for coffee, tea or energy drinks before bed. Uses caffeine half-life and a 2023 meta-analysis of 24 studies on caffeine and sleep.
- [Sleep Calculator](https://sleepbrief.com/sleep-calculator/): Free sleep cycle calculator. Enter your wake-up time or bedtime and get times that fit 90-minute sleep cycles, with an adjustable time to fall asleep.
- [Contact](https://sleepbrief.com/contact/): Get in touch with the Sleep Brief editors about corrections, topic ideas or sources we should read. We can't give personal medical advice by email.
- [About Sleep Brief](https://sleepbrief.com/about/): How Sleep Brief researches and checks every article, how we grade the evidence for supplements, how we use AI tools, and how the site makes money.
- [Terms of Use and Medical Disclaimer](https://sleepbrief.com/terms/): Terms for using sleepbrief.com, including our medical disclaimer, how our calculators estimate, how affiliate links work and how you may reuse our content.
- [Privacy Policy](https://sleepbrief.com/privacy-policy-2/): What information sleepbrief.com collects, how Google Analytics and affiliate cookies work here, and how to ask us about or delete your personal data.
- [All Sleep Topics](https://sleepbrief.com/topics/): Every Sleep Brief guide in one place, grouped by topic: falling asleep, sleep science, supplements, bedroom setup, gear, habits, life situations and problems.