Cat dreams

She was a cat by night, and used to wake with the taste of blood in her mouth, but as her fur greyed all that was too much. In those colder, darker nights, when the cat-dreams came she leapt from her own bed and padded over to the box room. In the daytime, her son never mentioned the strange cat that slept on his bed. Perhaps he thought he dreamed it. When they were older, and the cat-dreams no longer came, he said he had held his tongue in case she didn't let the cat come in any more. She said no, no, no. That could never have happened.