Answer:

nightowl

Answer	Crossword Clue
NIGHTOWL	Late-show watcher, say
NIGHTOWL	Late sleeper, perhaps
NIGHTOWL	Early bird's opposite

NIGHTOWL	Late-show watcher
NIGHTOWL	Keeper of late hours.
NIGHTOWL	Devotee of the late, late show.
NIGHTOWL	One who doesn't retire early
NIGHTOWL	One putting off retirement as long as possible?
NIGHTOWL	Midnight oil burner?