Tents for what?

A few days ago, during the Holy Mass, the Priest preaching the homily was talking of Peter asking Jesus if he could build tents - the transfiguration scene.  In order to waken one of the boys who was dozing, the Priest asked him, "Why did Peter want to build the tents?" The boy replied, "So that they can come back and sleep."

And only poor Peter is blamed (in the Bible) for not knowing the answer!