Gotta little intel here about human behavior in the summertime.  A new study says that people do yawn less in the summertime than we do in the wintertime. 

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Researchers have found that people often yawn to force air toward their brains to cool things down up there in our heads--this is something I didn't know--we actually cool our brains down.  Looks like us humans are almost twice as likely to yawn during the winter because the cool air (and Lord knows we have enough of that here in North Dakota)  ends up doing a better job of reducing the temperature of our brain.  Turns out that yawning is far less effective when temperatures outdoors are about the same as the human body. (Wall Street Journal)