It's true. The daily grind dealing with bosses, colleagues and repetitive work sours people's moods. But scientists say the cause appears to be something more than the work itself; people's biological clocks appears to be sending a message. "Though it might seem intuitive to suggest that the decrease in mood level during the midday hours is a result of workday-related stress," said Scott Golder, lead researcher for a study appearing today in the journal Science, "it turns out we see the same rhythmic shape on the weekends, when people typically are not working. This suggests to us that something more enduring is going on, such as the effect of biological processes and sleep"........


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