There are many theories about why people yawn, but no one knows for sure.
"We believe that contagious yawning indicates empathy. ... children with autism
spectrum disorders do not increase their yawning frequency after seeing videos ...
Jun 28, 2013 ... Pinpointing exactly why we yawn is a tough task, but the latest research suggests
that our sleepy ... Even human babies do it inside the womb.
May 7, 2014 ... We yawn when we're sleepy or bored or if we see someone else yawn. Some
people also yawn when they're anticipating something important ...
Not all yawns are the same. Most of us yawn and stretch (pandiculation) when we
wake up or go to bed, yawn when we are bored or when we need to “pop” our ...
Mar 12, 2014 ... What makes yawning so contagious? Watch the 'Yawn-O-Meter': http://bit.ly/
1qwFDrx SUBSCRIBE: http://bit.ly/10kWnZ7 Instagram and Twitter: ...
Jan 22, 2015 ... Throughout the ages, people have wondered and invented explanations – some
reasonable and some quite far-fetched – as to why we yawn, ...
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 ...
... most important jobs appears to be to cool off the brain, which makes a lot of
heat. We do yawn more when we are sleepy and brain temperature is increasing.
Aug 19, 2014 ... Most people yawn upon seeing someone else do it, but infants and people with
autism or schizophrenia aren't so affected by this contagion ...