This is so bizarre. I'd never come across this thread before (at least, I don't think I have...), and I see the last post (before mine) was by Stella at the end of June, this year. I was just talking about this on another thread, because when I was a child, my sister told me this story (she changed a few small details, saying that the killer was hiding under her bed, and licked her hand which was dangling down as she was sleeping, pretending to be the family dog), and as a result, I was terrified to go to bed at night for the next 8 years or so. I had a nightly ritual that included looking under my bed once I was safely in bed, and then lining up my stuffed animals in a vertical line beside me, so if a man like that were hiding under my bed, he would get the animals instead of me.
My mom worked for Beverly's dad, which is probably what interested my sister so much, and made her tell me the story. It happened the year before I was born.