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A comment on Evidence that birds sleep in mid-flight. Parent comment

Re:Evidence that birds sleep in mid-flight by throwaway98764 on Thursday October 27, 2016 @07:26PM (#12811385)
Gives a new meaning to the term, "sleep with one eye open at night." :)
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Re:Evidence that birds sleep in mid-flight by glandium on Thursday October 27, 2016 @08:28PM (#12811764)
Let me venture a guess: that expression comes exactly from observing animals keeping one eye open.
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