Dave asked Noah last night if it was time for bed.
Noah replied, "No. My yawns haven't come yet."
"Well, maybe they'll come upstairs when you lay down."
"No. We have to wait for my yawns to come."
A few minutes later Dave and I are in the kitchen and Noah comes running in. He's very excited when he yells, "MY YAWNS CAME!!! It's time for bed!!" and off he went to bed for the night.