No matter how tired you are…

hold it in….

you can do it!

Someone yawning while you are talking to them, regardless of them being legitimately exhausted, will make you believe that they are uninterested in what you are saying.

Translation:  Yawning while someone is speaking to you comes across as rude and inconsiderate!  Do whatever it takes to suppress it!

Imagine if the shoe were on the other foot…