To read or not to read

I wonder what is the evolutionary basis for the guilt one feels when around the house alone with one's kids. On the one hand, if they're quiet and/or entertaining themselves, I want to leave them alone in expectation of the next time they get in a fight or come begging for attention. It's good for them to be happy on their own. Have a little precious time to myself. Read. Blog. Clean. On the other, I feel like I'm away a lot and therefore should spend time with them.

I suspect many non-psychopathic parents no what I'm talking about. It's pretty common.