Google dance... It happens, to be honest tracking day to day, or hour to hour will drive you nuts... I don't check that more than once a month if that.
On the other hand, I watch traffic like a hawk... I've had a couple of sites go down in the past for a few days because something got changed, and I wasn't watching, so now If I see a drop that isn't within a normal range, I start looking to find out what is up with my sites...
But the number of indexed or not indexed pages really doesn't even cross my mind.