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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
Ducks frequently do hemispherical sleeping but this one is apparently seeing all he wants to see through both of it’s the nictating membranes, a.k.a third eyelids. They are translucent and presumably shapes and motion are detectable enough when detail isn’t required. Hemispherical sleep allows the duck to close one eye and shut down half it’s brain for sleep while being completely awake and alert in the other half. Then, they switch sides to rest the other half. Some other species also have this ability, even while flying.
Nice post!