CNN - There's no such thing as a case of the Monday's, according to a survey.
Researchers at Stony Brook University in New York analyzed Gallup telephone poll data from a large national survey .
Even the weekends aren't safe. A separate study found people are grumpiest on Sunday, possibly because they are depressed about returning to work the following day.
Health magazine quotes a Harvard University professor who suggests thinking of a good thing to look forward to each day to brighten your mood.
You can read the full report here: http://www.tandfonline.com/doi/abs/10.1080/17439760.2012.691980?&
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