Interesting quote from your article: > The paper's authors ... said it was likely that people with late body clocks were being harmed by having to adjust their

Interesting quote from your article: > The paper's authors ... said it was likely that people with late body clocks were being harmed by having to adjust their habits to a "morning lark world". Scientists say that about 40% to 70% of a person's circadian rhythm, or body clock, is genetic. Part of it you don't have any control over. In other words, the "night owls" might have health problems because of the effort and stress of trying to keep their body clock in sync with the rest of the world. If they could live a 25 or 26 hour day, they might be just as fit as the 24-hour "morning larks".