I'm sure Rita has her hands full with the two other brats as it, especially playing chicken with the girl over that damn iPod.
I like Rita, alot.
But, the writing is wonderful. They're really just showing Dexter struggling to be it all.
I mean, let's be honest here. Dex could probably get sleep if he didn't kill people. Probably not spend all the prep time he pours before a kill.
It's damn good to see him trying to find that balance.
Check out season 1. You might find what you're looking for. And Season 2, or was it 3?, that had Dex confront the mystery of what happened to his mother was pretty powerful.
The man's got emotion. He just buries it. And still, we see it.