Goodnight Moon turns the classic storybook into a relaxing digital e-book. The book includes the classic illustrations and the option for a soothing narrator. Children can use the optional spyglass to find hidden treasures in the illustrations. Subtle interactive sections are included on each page, such as playing with the mittens or making the cow jump over the moon. Everything about the e-book should help your little one drift off to sleep. Goodnight Moon costs $4.99 and is appropriate for children ages 3-6.