Up Late = Eat More?

A recent study reported in the Chicago Tribune, entitled "People who stay up late eat more, eat worse, study says," appears to indicate that night owls tended to not only eat more (adding up to a 2-lb a month more weight gain than non-late-nighters), but ate worse and had higher BMIs. What could some of the contributing factors to this be? What critiques might you have of this study, and what more research would you like to see conducted on the link between sleep and eating?