Yawning

 Way back when, at mankind’s dawn,

Before most known inventions, 

Humans gave in to a yawn

Despite their best intentions.

Yawning never disappeared;

It’s lasted through the ages 

And to a yawn a face is geared

When thinking disengages.

Tiredness could be the cause 

From lack of sleep or illness 

Or when somebody needs a pause

From boredom’s awful stillness.

One more reason mouths give in

To open is the spawning

Of the contagion which will win

When other folks are yawning.