A nursery rhyme that toddlers can relate to Little Bo-Peep has lost her sheep and can't tell where to find them . . . The Bo-Peep in question here is a wakeful youngster at play in her crib. And the sheep: two stuffed toys whom she lets fall over the rail. There is no hesitation on Bo-Peep's part to make known to the world her distressing situation, and soon her sleepy-eyed parents come to the rescue. Of course, when her parents leave the room again, there are no guarantees that the little girl is done playing shepherdess.