Six easy-to-use masks let parents demonstrate what happens when its time for bed. Soothing, gentle rhyme encourages babies to close their eyes like the characters in the book. Ideal for bedtime, this book is sure to become a part of a beloved bedtime ritual. Full color. Six easy-to-use masks let parents demonstrate what happens when it's time for bed. Soothing, gentle rhyme encourages babies to close their eyes like the characters in the book. Perfect for bedtime, this book is sure to become a beloved ritual.