Seperate question about NUS and idle time

I post this separate so as to not wind up with several different issues on one thread
When I look at the performance information using the NIS performance tab on the NIS GUI
I see large periods of idle time now. Which should be correct given my PC is on while nobody is at home
However, I notice that the same time the PC is "idle" there are indications in other NIS logs (live updates for exam)

 

sRory should be NIS in the topic line