Where the data comes from
Sleepiest tracks sleep automatically on your phone by detecting the periods each night when the phone is undisturbed. Each tracked night gives us a sleep start time, a wake time, the total time asleep and the number of times sleep was broken.
Our pages use anonymised averages across Sleepiest users who track their sleep. Thousands of nights are recorded every day, mostly from the United States, the United Kingdom, Canada and Australia.
What each measure means
- Sleep
- Total time asleep in the night, adding up every sleep period between falling asleep and getting up.
- Wake-ups
- The number of times sleep was broken during the night: the gaps between sleep periods.
- Bedtime and wake time
- The local time sleep actually began and ended, not the time people planned to go to bed.
- Nights
- A night is labelled by the evening it begins, so “New Year's Eve” is the night of December 31st into January 1st, and “Sunday night” is the night before Monday.
How we compare nights
Sleep varies a lot by day of the week, so we never compare a holiday with an average night. Instead, each night is compared with the same weekday in the four weeks before and after it. Other events we track, and the Christmas to New Year period, are left out of those comparisons so one unusual night doesn't distort another.
Clock changes are compared with the surrounding Saturday nights. Full moons are also compared with new moons, which act as a control.
When data is published
Phones keep syncing a night's sleep for several days, so the most recent three nights are held back until their averages have settled. Pages update daily.
The figures start on January 20, 2025, when the current version of our sleep tracking had fully rolled out. Earlier nights were measured differently and aren't comparable, so they're not included.
Privacy
Everything published is an average across many people. A country or group is only shown when it has enough sleepers for a reliable average, and no individual's data can be seen or worked out from these pages. See our privacy policy.
Limits
Sleepiest users are people who care about their sleep, so they are not a representative sample of any country's population. Phone-based tracking measures when the phone is undisturbed, which closely follows, but isn't identical to, the time spent asleep. Differences of a minute or two between nights are within normal variation.
Using our data
You're welcome to quote, chart or embed our figures. Please credit “Sleepiest” and link to the page you used. Every chart has an Embed button and a CSV download.