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?

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