One problem I have with the graph is that the height of the sections of data for each day does not have a clear meaning.

For instance, look at Dec 23 and Dec 24: the top orange section drops from 31k to 29k, but the visualization shows a thicker orange height on the 24th than the 23rd. In fact, the entire graph is significantly higher on the 24th, but it is not clear what this means either.