You said they turn into dolls so that explains the Barbie part. Also, Barbie is often associated with "Barbie's Dream House" but since it's a sleepover it's literally a dream house. Don't publish a real novel with that title though because you could get sued.
The narrator wants to see the "Evil Eye" once more before he kills the old man, but each night for the first week the old man is asleep when he sneaks into his room. Hope this helps! =)
