Not only can are the boundaries of days problematic: For activities which typically span across day-boundaries, one might take different approaches regarding to which day the data should be associated. Tracking sleep is a typical example of this: If you go to sleep before midnight on day X and wake up on day X+1, for which date do you want to associate the summary statistics of your night's sleep? | Not only can are the boundaries of days problematic: For activities which typically span across day-boundaries, one might take different approaches regarding to which day the data should be associated. Tracking sleep is a typical example of this: If you go to sleep before midnight on day X and wake up on day X+1, for which date do you want to associate the summary statistics of your night's sleep? |