22/07/2026
Our data science team analyzed 50 billion data points. Our archive of human biology reaches back to December 2016 - sleep, runs, heartbeat intervals.
MYTH: Everyone needs 8 hours of sleep, and most people are falling short.
TRUTH: “Eight hours or more” appears on only 26.9% of nights. The median across the dataset is 7h 09m, and 21.4% of nights - more than one in five - finish under six hours entirely, for ordinary users rather than an unusual subset. The more important point is structural, not statistical: a system that scores sleep once, from a single night, is only ever reporting a snapshot. Meaningful personalization requires recalculating a person’s baseline, trend, and recovery pattern every time new data arrives, that’s 81.8 million recalculations a year, or roughly 224,000 a day, run continuously so a score reflects a living model of the person rather than one frozen night.
For most of history, people slept in two four-hour phases with a waking period in between - a pattern historian Roger Ekirch traced across centuries of diaries, literature, and court records. The “8 hours” phrase itself traces to a labor movement slogan, not a sleep study.
