Overall, my productivity & creativity looks like a gently downsloping graph throughout the day. There are some dips and surges, but in general that is the trend. Three hours first thing in the morning is significantly more valuable -- I prioritize my work/side/personal life so that on any given day I make sure I stack the important stuff earlier if I can.

Our neighbors are the 7pm family. They own their own business and they're out the door at the crack of dawn to tend to things. The kids have always gone to bed at 7pm, except the teenager of course. So such families do exist, but I think it's important that the whole family be on the same schedule, for the reasons you mention.