Ghost Baby

I'm lying in my bed, barely able to open my eyes after a deep nap. My baby (OK, my preschooler) is sleeping in her room, too.

I can hear my sister approaching on the stairs and she starts to head into my daughter's room.

"Where are you going?" I whisper
"The baby's awake." She says, pointing to the room.
"No, she's still sleeping." The room is silent.
"I swear I heard her!"
"You heard the ghost baby."