How Can Birds Sleep While They're Flying?

Scientists have found a bird that can fly continuously for weeks at a time and sleeps in the air. How do birds sleep mid-flight?

Do Insects Sleep - https://youtu.be/Ez_OvlQw7dY
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Nonstop Flight: How The Frigatebird Can Soar For Weeks Without Stopping
http://www.npr.org/sections/thetwo-way/2016/06/30/484164544/non-stop-flight-how-the-frigatebird-can-soar-for-months-without-stopping
"Frigatebirds, seagoing fliers with a 6-foot wingspan, can stay aloft for weeks at a time, a new study has found. The results paint an astonishing picture of the bird's life, much of which is spent soaring inside the clouds."

Scientists have just seen birds sleep during flight for the first time ever
http://www.sciencealert.com/scientists-have-just-seen-birds-sleep-while-flying-for-the-first-time-ever
"Scientists have been able to observe birds falling asleep mid-flight for the first time - an ability that's long been suspected but never been proven. But even though researchers had thought this might be the case, the new research shows that the way birds nap in the air is much stranger than we ever expected."

Evidence that birds sleep in mid-flight
http://www.nature.com/ncomms/2016/160803/ncomms12468/full/ncomms12468.html#methods
"Many birds fly non-stop for days or longer, but do they sleep in flight and if so, how? It is commonly assumed that flying birds maintain environmental awareness and aerodynamic control by sleeping with only one eye closed and one cerebral hemisphere at a time."

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