Editorial policy
This page explains who is behind SleepGuru, how every guide and calculator is made and checked, and why we publish them, so you can judge how far to rely on what you read here.
Who is responsible
SleepGuru is produced by a small editorial team. Every page is fact-checked before it is published. John Smit, a sleep researcher with ten years in the field and a blogger, then reviews it in detail. A page he has signed off shows "Reviewed by John Smit" and the date at the top; until then it is marked "Review pending" and is credited to the SleepGuru editorial team.
How a page is made
- One question per page. We start from questions people actually search for about sleep and waking up, and give each question a single page, so pages do not repeat or compete with each other.
- Drafted with AI from published sources. First drafts are written with the help of AI tools, working only from published research and guidance from health agencies, sleep medicine societies and peer-reviewed journals.
- Every key claim is cited. Claims that matter carry a numbered citation that links to the source list at the end of the page.
- Sources are checked automatically and by hand. Every cited link is checked to make sure it exists; for studies we confirm the paper's title matches what we cite. A fact-check compares the page's claims with what the sources actually say.
- Expert review. After publication John Smit reads the whole page, corrects or withdraws it, and signs it off. Until he has, the page says so at the top.
We do not run clinical studies or laboratory tests. Unless a page says otherwise, its recommendations come from the cited research, not from our own experiments.
Which sources we use
We rely on government health agencies (such as the NIH, its National Heart, Lung, and Blood Institute, and the CDC), sleep medicine organisations (such as the American Academy of Sleep Medicine), national health services (such as the NHS), major academic medical centres, and peer-reviewed research. We do not cite blogs, forums, product pages or other sites that sell sleep products as evidence.
How our calculators work
Each calculator explains its formula, its assumptions and its limits on the same page. Most sleep calculators rest on averages, for example a sleep cycle of about 90 minutes even though real cycles vary from roughly 70 to 120 minutes between people and across a night. Treat every result as an estimate to adjust to how you actually feel, not as a measurement of your body.
Health information
SleepGuru is general information, not medical advice, diagnosis or treatment. If you have persistent insomnia, loud snoring or pauses in breathing during sleep, or daytime sleepiness that affects your safety, please talk to a doctor.
Independence
SleepGuru does not run advertising, affiliate links or sponsored content, and no company pays to be mentioned. If that ever changes, we will say so clearly on the pages concerned and on this page.
Updates
Each page shows when it was last updated and when it was last reviewed. We revise pages when we find an error, when a reader reports one, or when the guidance they rely on changes, and every substantial revision is fact-checked and reviewed again.
Corrections
If you spot a mistake, email [email protected] with the page address and what you think is wrong. We check it against the sources, fix confirmed errors and update the page date.
Why we publish
Sleep advice online is often vague, contradictory or written to sell something. We want to give clear, sourced answers and free tools you can use tonight.