A yawn is quite catching, you see. Like a cough.
It just takes one yawn to start other yawns off.
Introduce little ones to the world of Dr. Seuss with this interactive adaptation of Dr. Seuss's Sleep Book that's perfect for babies and toddlers. From yawns and the sound of brushing teeth to silly snores and a lullaby melody, the twelve sounds featured in the story are almost guaranteed to make kids (and adults!) sleepy, making this an ideal read before naps or bedtime.