Yawns, Cellphones, and Postures

<p>Driving down the road the other day, I saw some people on their cellphone and I felt the urge to grab mine.  Where does this urge come from?  How similar is it to yawns and postures?<br /> <br /> <a href= "http://www.billybon3s.com/">http://www.billybon3s.com/</a><br /> <br /> <a href= "https://www.tabletopwoodworks.com/">https://www.tabletopwoodworks.com/</a></p> <p><a href= "https://podcastapps.com/">https://podcastapps.com/</a></p> <p> </p>