The originally self-published Swedish children’s book The Rabbit Who Wants To Fall Asleep may seem to be an overnight sensation, but its success, claims author Carl-Johan Forssen Ehrlin, is actually the result of a slow build over roughly five years. According to Ehrlin, the sudden spike in international sales for the book—which Random House Children’s Books bought for seven figures in August and released on Friday—is thanks to a perfect storm: word-of mouth praise driven by e-book giveaways, coupled with Amazon U.K. providing entrée to consumer media once the self-published book had taken off. Read more…