Owl is confused. She doesn't know what tomorrow means. When does today turn into tomorrow? Does tomorrow begin in the middle of the night, at a certain time in the morning or not until you wake up? Mouse, Hedgehog and Rabbit try to explain, but Owl still doesn't understand. The forest animals make a plan to stay awake all night to find out, but what if they fall asleep? How can you tell it's tomorrow if it's already today when you get there?