Here's a look at when I tend to post during the day (in EST). It's kind of small because I didn't want to make it inconvenient for those that use lower resolutions. The red lines represent the total number of posts, while the blue coloring is a subset showing just Steam Vent posts. You can see where I tend to get my four to five hours of sleep.
The posts during business hours are almost exclusively done on the weekends, but boy do I try to make up for lost time.
Apparently, I tend to be more helpful on weekend mornings and more of a Steam Vent whore late at night.