The biggest change I've noticed is the presentation of sleep data. Sleep history is no longer available in one place. The various sleep graphs have been combined into one, with no ability to expand the view. The restoration sleep graphs are gone, no data on when you were in restoration sleep and no data on estimated oxygen variation. Also, fitbit sometimes screws up sleep start time and sleep end time. In the previous UI I could correct these mistakes, but not now. Fitbit REALLY needs to have someway of making these changes available for testing before inflicting them on their users.
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