Maybe this happens to you too, i'm always wondering, why there are few of visitor in my blog on Saturday or Sunday. The revenue and the impressions, both drops to the bottom.
This symptomp isn't new one to be happened. Every weekend, or even holiday, blog's visitor always dropping. I don't research on any other blog which have different topic. But some of my friend's blog occuring the same thing. So, i guess, and in my opinion, in the weekend, blog's visitor usually dropped.
If you have any other opinion, please leave some comment, I will happy to heard from you :)