Learn more about the variety of fascinating ways animals sleep: from upside down and holding hands, to sleeping while swimming or flying Did you know otters sleep while holding hands; zebra finches rehearse their songs while dreaming; ducks and dolphins sleep with one half of their brains at a time; and, frigate birds sleep while flying? A Songbird Dreams of Singing: Poems about Sleeping Animals is a book of poetry with a scientific-and child-friendly-underpinning...