About DozeClock

DozeClock exists for one moment: it is late, you know what time you have to be up, and you want a number — not an article.

Every page on this site is built from a small set of public sources: the National Institutes of Health on sleep cycles, two expert panels (the National Sleep Foundation's 2015 panel and the American Academy of Sleep Medicine's consensus statements) on how much sleep each age needs, NASA's nap research, the FDA and USDA on caffeine, and a handful of peer-reviewed studies on sound and sleep. We take the numbers, do the arithmetic, show our working on the methodology page, and cite the source under every table.

Who makes it

DozeClock is written and maintained by a small independent team — the same people who make Curing Insomnia: Fall Asleep, a free iPhone app of layered sleep sounds with a timer. We are not clinicians and do not pretend to be: there are no doctor photos here, no "medically reviewed" badges, and no advice about medication. Where the evidence is thin — most of the research on sound and sleep, for instance — the page says so.

What we are not

Not a sleep clinic, not a tracker, not a newsletter funnel. No accounts, no cookies, no pop-ups. If a number here does not match your experience, your experience is the better data: the ranges are population averages, and the point of showing three bedtimes instead of one is that bodies vary.

Corrections

If a figure is wrong or a source has been updated, tell us. Corrections are logged on the sources page with the date.

The small print

Terms of use · Privacy · Disclaimer · Affiliate disclosure (there are none) · Credits for the photographers and typeface.