Since all of the swing states are in the East, I expect that the tea leaves will be plain to see by 9:30 or so. I'm not looking for widespread riots for a few days or more as it will take that long to gin up a good enough reason to get folks out en masse. I plan to go to bed early to beat the rush...
You are right about en masse riots. If there are riots election night, they will be less in number I think. If organized riots happen, that would likely start two days after the election. However, we will get a sense of the turmoil the day after.
I normally stay up until 1 or 2 in the morning, so staying up won't be difficult for me.