I went out early yesterday morning to put the garbage can out by the street, and I noticed that all of our plants near the driveway were covered with these disk-shaped webs. They weren't there the previous day, so some kind of spiders had been really busy Monday night! (Click on photos to enlarge.)
I didn't see any of the spiders that did all the work. I guess like most folks who work the night shift, they were probably somewhere fast asleep once the sun came up.