Studying is a Yawn

I am home today studying for my upcoming conflicts exam and I am listening to recorded class lectures. Everytime I hear myself yawn on the tape, I yawn again. Isn't that wierd? I am yawning a lot on the tape, so am yawning a lot now too. But that is not as wierd as the other thing that recently made me yawn. I saw a photo of a tiger yawning that went with an article about why animals yawn. Just looking at the yawning tiger made me yawn. Over and over. Even writing about the tiger yawning is making me want to yawn. What a yawn......