Editorial policy
How This Site Is Researched and Updated
Who writes this site
Every page is written and maintained by the Sleep Time Calculator Editorial Desk. The editorial desk writes and maintains every page on this site. Each calculator is built from published sleep-medicine sources, and each claim carries a numbered reference that readers can open and check. The desk is not a medical practice and does not diagnose or treat anything.
The site is run by one small team rather than a newsroom, so there is no separate copy desk and no sponsored content. What that means in practice: the person who writes a page also checks its sources, and the same person answers the corrections inbox. We say so because a single-desk operation is a real limitation — it is honest, but it is not the same as institutional review.
What counts as a source
Sources are ranked in three tiers, and only the top two are ever cited. A claim that cannot clear tier 1 does not become a number on this site.
| Tier | What it covers | How we use it |
|---|---|---|
| Tier 1 | Peer-reviewed journals, consensus statements, and government health agencies AASM/SRS consensus statements, the National Sleep Foundation's duration review, CDC Yellow Book, NHLBI, StatPearls. | Any number we publish — sleep durations, cycle length, onset latency, jet lag rates — has to come from this tier. |
| Tier 2 | Academic reference works and clinical reviews StatPearls chapters, review articles in Sleep and Sleep Medicine Reviews. | Used to explain mechanism — how stages are structured, what sleep inertia is — never to set a headline number on its own. |
| Tier 3 | General health publishers and news coverage Consumer health sites and press coverage of studies. | Background reading only. Not cited, and never the origin of a figure. |
Each tool and guide ends with a numbered list you can open. The numbers in the prose map one-to-one onto that list, so a claim and its evidence are never more than one click apart.
What the calculators assume
Every calculator on this site is an arithmetic model with fixed inputs. Those inputs are listed here in full rather than buried in a footnote, because the assumptions are the part that can mislead.
| Assumption | Where it applies | Why that value |
|---|---|---|
| 90 minutes | Cycle length in the sleep time calculator | The adult average across published stage descriptions; real cycles run roughly 70–120 minutes and lengthen toward morning. |
| 14 minutes | Time to fall asleep | The midpoint of the 10–20 minute adult sleep-onset range, so the tool does not quietly give you a shorter night than you asked for. |
| 1.5 / 1 hour per day | Jet lag adaptation, westbound / eastbound | The CDC Yellow Book's working rates. Above 12 hours of difference the shorter arc is used instead. |
| 2 hours per night | Maximum sleep-debt repayment | A scheduling cap, not a medical limit. It exists to avoid telling people to sleep four extra hours at once, which shifts the body clock. |
None of these tools reads your body. They cannot see which sleep stage you actually wake from, how long your own cycles run, or whether your night was fragmented. Their output is a planning figure built on population averages.
Where the site stops
We explain sleep timing and sleep duration. We do not diagnose, and there is no calculator here for a condition, a medication, or a supplement dose. Three specific limits:
No self-diagnosis tools. Nothing on this site scores you for insomnia, sleep apnea, or a circadian rhythm disorder. Those require a clinical assessment, and a web form that pretends otherwise mostly generates anxiety.
No dosing advice. Melatonin appears only as context — the timing question belongs to a clinician, and marketed products vary in actual content.
No replacement for care. If you need more than about 30 minutes to fall asleep most nights, wake unrefreshed after a full night, snore heavily, or feel sleepy while driving, the next step is a clinician rather than a longer bedtime window.
Review status
Every page carries a review date in its byline and in its structured data, and that date only moves when the text actually changes — a sitemap that stamps every URL with today's date teaches search engines to ignore it.
Medical claims are checked against their listed sources by the editorial desk at each review. We have not yet engaged a named clinical reviewer for those claims. When we do, their name and credentials will appear in the byline of every page they have reviewed. Until then, treat this site as an explanatory reference rather than a clinical authority.
Corrections
If a number here is wrong, or a page overstates what a study shows, we want the specific detail rather than a general complaint. Write to [email protected] with the page URL, the sentence, and — where you have one — the source that contradicts it.
Substantive corrections are applied to the page and the review date is moved. Where a correction changes a figure a reader may have acted on, the change is noted in the page itself rather than made silently.
Advertising and independence
The site displays Google AdSense advertising, which pays per impression and click. Advertisers have no input into what we write, no advance sight of a page, and no ability to request a change. There are no affiliate links, no sponsored posts, and no paid placements in the reference tables.
The tools themselves are free, require no account, and run entirely in your browser — nothing you type into a calculator is sent to a server. What the site does collect is described in the Privacy Policy.
Sources
Numbers in the text point here. These are peer-reviewed papers, consensus statements, or official public-health pages you can open and check. The calculators still use planning averages; they are not a personal sleep study.
- Watson NF, et al. Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society. Sleep. 2015;38(6):843–844.
- Hirshkowitz M, et al. National Sleep Foundation’s sleep time duration recommendations: methodology and results summary. Sleep Health. 2015;1(1):40–43.
- Paruthi S, et al. Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine. J Clin Sleep Med. 2016;12(6):785–786.
- Patel AK, Reddy V, Shumway KR, Araujo JF. Physiology, Sleep Stages. StatPearls. NCBI Bookshelf. Updated 2024.
- Sleep Foundation. Sleep Latency: How Long Should It Take to Fall Asleep? (typical adult onset about 10–20 minutes).
- CDC Yellow Book. Jet Lag. Travelers’ Health.