the condition of having bloodshot eyes, as from eyestrain or lack of sleep.
Also, red eye, redeye. Informal. a commercial airline flight between two distant points that departs late at night and arrives early in the morning.
redeye ( def 3 ).
an unwanted photographic effect in which a person's iris appears to be red: caused by the reflection of a flashbulb off the blood vessels of the retina.
Also, redeye. Informal. of or indicating a long-distance flight that leaves late at night: the red-eye special from New York to Los Angeles.

1965–70, for def 2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
 a.  an aeroplane flight leaving late at night or arriving early in the morning
 b.  (as modifier): a red-eye flight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"airplane flight which deprives travelers of sleep," 1968, from the red eyes of sleeplessness; earlier as a noun meaning "raw and inferior whiskey" (1819, Amer.Eng.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It tries for a chipper, light-hearted tone, but it gives the audience a
  grueling flight-a red-eye to nowhere.
Red-eye flights are popular with business travelers looking to make a
  city-to-city jump without losing a workday.
Resting during your flight can make a big difference in how much jet lag you
  experience, especially if you are flying the red-eye.
Avoid red-eye flights, because the trip is only five hours and you won't have
  much time to sleep.
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