Anybody Home?

I'm kind of a statistics junkie. Not standard deviations and correlations and all that, but numbers and percentages in general. I love the back of a baseball card.

For some reason tonight, as I was looking off my porch watching lights come on in houses up and down the street, I wondered what percentage of people, on average, spend the night in their own house or apartment. How does it vary by day of the week, or by state and city of residence, or by age?

I don't know, but that kind of thing is interesting to me. Dull as dirt, I suppose