Written by Margaret Wise Brown and illustrated by Clement Hurd. This is a really basic idea and it works. It does a great job of getting kids in the head-space that it's time to say goodnight and go to bed. The definition of an effective bedtime story because it's so basic and doesn't leave the child's mind racing and excited about a complex story. I have to hand it to Margaret Wise she most certainly understood the power of repetition and the subconscious. It was written in 1947 and still finds it's way into the hands of children everywhere.
Goodnight Moon slowly became a bestseller. Annual sales grew from about 1,500 copies in 1953 to 20,000 in 1970; by 1990, the total number of copies sold was more than 4 million. Currently, the book sells about 800,000 copies annually and by 2017 has sold an estimated 48 million copies in total. So it's safe to call this one a classic. Goodnight Moon has been translated into 12 languages.
This book has been adapted into a 27 minute animated video. On top of that has found a place in pop culture by being featured or parodied in many television shows like Sesame street, Animaniacs and Dinosaurs. It has been featured in DC's Batman comic books. Young Bruce Wayne is depicted reading "Goodnight Moon" with his mother. It has was made into a play in 2007 in Seattle's Children's Theater and has since toured to multiple cites. Goodnight moon is so simple and really a work of perfection and that's why it's still around 70 years later. That's why I recommend it to be part of your children's bookshelf.