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A Garmin device records each night's sleep and its stages, and an overnight health status: heart rate, heart-rate variability, breathing, skin temperature and blood oxygen. Before asking it anything specific, the first question is simply what is there: how many nights, what a typical night looks like, how it has moved, and whether the last month looks like the rest. George has worn a Garmin Index Sleep Monitor at night since January 2026.
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