There are many theories about why people yawn, but no one knows for sure.
. File:Fetal yawning 4D ultrasound ecografia 4D Dr. Wolfgang Moroder.
theora.ogv Play media. Video of a yawning fetus at ...
Sep 23, 2011 ... People yawn more easily in cooler temperatures, supporting the idea that
yawning ... 23, 2011-- Why do we yawn? ... MS Symptoms & Causes.
Aug 19, 2014 ... Scientists working to unravel the mystery surrounding the yawn, and why it's
contagious, have discovered that yawning is much more ...
So what's behind this mysterious epidemic of yawning? First, let's look at what
this bodily motion is: Yawning is an involuntary action that causes us to open our
Jun 10, 2013 ... The most recent research on yawning suggests that it exists to cool down the
brain. That open-mouthed yawn causes sinus walls "to expand ...
May 12, 2014 ... A new study has suggested that the reason we yawn has nothing to do with
tiredness or boredom, but actually works in order to cool down our ...
Excessive yawning that happens more often than expected, even if drowsiness ...
You may need tests to look for medical problems that are causing the yawning.
Aug 12, 2014 ... Yawning has puzzled scientists for more than two millennia. ... the cavities that
should cause our mucus to evaporate, which should chill the ...
Yawning might serve a social function (to communicate boredom) and a ... that
yawning causes an increase in blood pressure, heart rate and oxygen in the ...