Chengdu Could Not, Would Not, Fall Asleep by Barney Saltzberg
High in his bamboo tree, a young panda named Chengdu lies awake while everyone around him is sleeping. No matter what he tries, he cannot fall asleep. He turns and he tosses. He scrunches and he rolls. He even hangs upside down. Finally he climbs up and up and up, until he finds the perfect spot atop his brother. Panda pile!