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An Oura ring records every night's sleep, heart rate, heart-rate variability, breathing and temperature, and every day's steps and activity. Before asking it anything specific, the first question is simply what is there: how much of it, what a typical night and day look like, how each measure has moved over the years, and whether the last month looks like the rest. Bill has worn one for three years.
PerSci · personal science, one person at a time