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The average human sleeps a total of twenty-four years over a lifetime. That's a lot of naps! Yet people aren't the only ones who enjoy a good rest; if you look around, you'll find that all animals have a biological need for sleep. But some animals snooze in ways that we would find startling--if not absolutely impossible. A sooty tern, an island bird, takes a nap in midair as it slowly flaps its wings. A fruit bat gets forty winks while hanging upside down from a tree branch. A bottlenose dolphin can put half of its brain to sleep while it continues to swim. What other remarkable methods of sleep exist?
The average human sleeps a total of twenty-four years over a lifetime. That's a lot of naps! Yet people aren't the only ones who enjoy a good rest; if you look
My little one, lay down your head.It's time to doze, it's time for bed.You tell me, "I'm not sleepy now.""Just try," I say. You ask me, "How?" In this lyrical a
Mother deer tuck their fawns in for the night; sea otters wrap themselves up in a blanket of seaweed to avoid being carried away by the tides. This delicately i
All people sleep. So do all other mammals. Birds sleep, too. Even snakes, fish, and insects have a way of sleeping. How different animals sleep on land, in wate
