I do get clicks throughout the day, but there seems to be a flurry at the very end. I'm of the belief that the system which processes the clicks now runs on a lag and has been doing so ever since google began filtering out inadvertant clicks.
However, the lag seems to have grown longer of late. Yesterday I was certain the day was going to be down, but when I checked this morning it was up. It's happened several times in the last week where the numbers for one day showed up substantially different the next morning than they were near the end of the night before.