Night-Night Puppy

Gabby was fast asleep and I hear from Zack, "Mommy? Hey Mommy!"
I went into their room, and Zack was rolling around on his bed not really wanting to sleep. So I laid down beside him and started rubbing his hand and his arm and he started talking nonsense, but I just agreed with him.
Finally, it got quiet and he started to relax and all of the sudden out of nowhere, a dog started barking. Zack perked up and said:
Zack: "Mommy, I hear a puppy. Woof! Woof!"
Mommy: "Yep, that's a puppy."
Mommy: "That puppy is saying night-night to you."
Zack: "Puppy have night-night time too?"
Mommy: "Yep, puppies have night-night time too."
Zack: "Oh, ok Mommy. Night-Night puppy. Zack have night-night time too."