It would be interesting to see the age demographics of the night owls.

I saw that, because when I was in my 20/30's I was very much a night owl.

Now that I'm in my 40's, I'm lights out by 10 or 11, and even on the weekends, I hate to sleep past 7 in the morning, because I feel like I'm sleeping my days off away and not really getting to enjoy them. Although 7 is still sleeping in for me (I work 5:30 a.m. to 4 p.m. M-F).