"Lord of the Flies" by William Golding

He then woke up and started to call for Ralph, he "...saw something moving among the trees, something big and horrid." At that point most of the "little 'uns" and most of the "big 'uns" started to laugh with a horrified sympathy. Right after they stopped laughing Ralph exclaimed that it was a nightmare, and that he was walking in his sleep. The days following that meeting
were different than they had been. From that time on they sent expeditions of hunters to find this "beasty" thing. At night some of the little boys had nightmares. They screamed and cried. …