How many hours holds your day?
Fourteen questions about your rhythm: sleep, light, caffeine, the evening. At the end: your day type, a score out of 14 hours and a map of where those hours go.
The mechanism of circadian clocks won the 2017 Nobel Prize in Medicine. Every question has a “why it matters” button, if you want to go deeper.
Answers never leave your browser: everything is computed on your device
Where the hours go
Hours don’t vanish without a trace: every lost one has a source in your answers. Remove the source, and the hour comes back.
Where the 14 comes from
In an adult, about fourteen hours pass from morning light to the opening of the “melatonin window”. That is how long the stable part of the day holds. The mechanism of the internal clock is described at the gene level, which earned the 2017 Nobel Prize in Medicine. The test assesses how much your lifestyle helps that window stay open: —
What your answers show
Where to start
A day, built hour by hour.
Three formulas of fermented plants for the three parts of the day: A.M., NOON and P.M.. Twenty-four plants, six drops per serving, EU warehouse.
Want to measure more precisely?
This test is a self-report: a few minutes about your typical day. The next step: Circadian App from Fourteen Hours. It reads your tracker data (sleep, heart rate, heart-rate variability), builds a forecast for the coming hours and runs an AI coach that suggests one small habit a week.
The app is included in the Fourteen Hours subscription at no extra cost and is still in development, the page shows what’s being built. Trackers don’t measure circadian rhythms directly: the app works with what the sensors record, which is more precise than any questionnaire, but it’s still not a lab.
Circadian App: what’s inside →Circadian Check: a project by circarythm.com.