Just discovered that Fitbit did the unthinkable and just stopped the CSV export function which most researchers and quantified life users use to compare their sleep data with other variables:
The good news is that the data export now contains most of your data, including “intraday” data (but excluding time zone information and tracklogs)! The structure of the exported data is a bit inconsistent, so I’m guessing it closely matches how they are storing the data internally…
It seems they restored this function following a barrage of negative comments - at least care for customer won in this case
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