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I have had the Fitbit blaze for a total of 24 hours and when I look at my heart rate stats in the app, it seems it was recording my heart rate until 2 o'clock in the morning. I have had no other recorded reading since then even though the blaze has been telling me my heart rate all day. I also just did a workout and no new heart rate information has been added.
@Gcombet how long ago was the last time the tracker synced? Did sleep show up? Have you tried a reset/restart of the tracker, hold the select and back buttons for 12 seconds