Though the researchers asked the students about their punctuality habits in general and found an association between staying up late and being tardy, I still think the study unfairly set the night owls up for failure. Admittedly, I happen to tend toward the owl end of the spectrum, but I think the researchers should perform the experiment some time later in the day. Indeed, I have a tough time waking up in the morning because I go to bed later, but that doesn't necessarily mean I'd be late for something in the evening (I hope!).
Anyway, as the researchers point out, this study is obviously not the last word on the subject, since this is the first ever study to examine the relationship between being a lark or an owl and being punctual. For now, at least, it gives us some understanding of why certain co-workers of ours can never seem to get to work on time.
(h/t New York Magazine)