Combining the sleep data and the stress data together would make sense in terms of the dats visualization. Since we do have both data in the app, why dont we see in a section where both of them plotted together. Therefore we could compare and see the sleep stages, i.e. deep sleep together with if that corresponds to the stressy regions during the night. One can analyse and see if the stress is increasing if one goes put from the deep sleep etc. the same could be applied to the other data we do have. I know time scale is the same and we have the data of hearth rate as a function of time, but plotting them together sith the sleep stages would help maybe to understand our body much clearly.