Bedtime stalling tactics

Nathan is starting to master the act of stalling bedtime. Now that he's potty trained he pulls that trick, as well as wanting some water, singing a song, having an ouchie somewhere, or there's a lion (or some other scary animal) in my bed? Most recently he began the"Just one more story mom" act. Tonight as I was putting him to bed for the fourth time, he asked me to read another story. I handed him "Goodmorning Digger" and told him to just look at the pictures. His response was, "But mom, I can't read." I couldn't help but laugh, and read it to him!