I live in the Google time zone (pacific) and have found that my Adsense revenue hits its daily half way point at around 9:30. My sites appeal to India and the US and a bit to Europe so it's kind of easy to understand why early -mid morning is my mid day. I get around 1000 clicks per day so that helps the consistency but it is amazing how consistent my 9:30 revenue predicts my full day. Have you noticed a comparable pattern?
I check them several times a day and scribble them down in my day planner so it's not too hard for me to notice the pattern.
i notice this pattern with my site. I am at Canada eastern zone time. When i wake to check my ad sense account before leaving to work i would have like 5-6 clicks which occurred during night. But when i come back from work, i only incurred 2 more clicks. Most my traffic comes from US and India. So this means, i incur those clicks from traffic from India. The US traffic is not so profitable.
My midpoint is all over the place.. about the only pattern at all that i've noticed is that ePC is way higher earlier in the day, then lowers significantly by mid afternoon..