Seems to me this was a rather unscientific experiment. If I turned off everything that makes light in my house, of course I'm going to go to sleep at 9 because there isn't anything to do except sleep. I also find it funny that the result was him being in a better mood as apposed to when he stayed up late and didn't sleep as much. du.
At the same time though, theres so much I could get done from getting home till bed time that someone who turns everything else won't be able to.
I find morning people struggle with the idea sometimes that you can naturally wake up around midday or in the afternoon and be even more productive that someone rising with the sun. In the end we all need sleep, when we get it though isn't as important to productivity as some think.
