Does anyone know how to interpret chat stress on the watch

I think the watch shows an instantaneous value whereas Connect shows the average value for the day. 

Correct.

rp1428: The watch says „last 4 hours“. In Connect the hours are marked with that dots on the x axis.
Only the last 4 hours look alright to me, compared to the chart on the watch.

BTW: Why the *** is your stress constantly so high?!?

Thanks  The chart stress on the watch face doesn't seem to align with either though. 

Yeah I live a pretty stressful life  

I think there's no problem at all: your last 4 hours is what watchface shows. They are between the 40-50 score, just the same that your Connect app shows for the last 4 hours.

When my stress chart looks like that, especially during sleep periods, I'm usually fighting an illness (often before symptoms appear).