red-eye
noun /ˈred aɪ/
  /ˈred aɪ/
 - (also red-eye flight)[countable] (especially North American English, informal) a flight in a plane at night, on which you cannot expect to get enough sleep
- We took the red-eye to Boston.
 
 - [uncountable] the appearance of having red eyes that people sometimes have in photographs taken using flash
- a flash mode that is designed to reduce the red-eye effect