DARPA's $20 million Preventing Sleep Deprivation (PSD) program aims to find ways for soldiers to stay awake and effective for as long as seven days. Dolphins and whales are providing a promising direction. These mammals survive on something called "hemispheric sleep," a state in which one side of the brain is awake while the other is unconscious.
Credit: Andrew Burton / Getty Images
The 2014 Adventure Issue
From Iceland's Highway 1 to Utah's Canyonlands, an epic itinerary for modern explorers.
Plus: Building a Bigger Action Hero
ON NEWSSTANDS NOW
Duke Lacrosse and the Fog of Scandal
How Thailand's Most Notorious Prison Became a Fight Club
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