Answer: nightowl

AnswerCrossword Clue
NIGHTOWLLate-show watcher, say
NIGHTOWLLate sleeper, perhaps
NIGHTOWLEarly bird's opposite
NIGHTOWLLate-show watcher
NIGHTOWLKeeper of late hours.
NIGHTOWLDevotee of the late, late show.
NIGHTOWLOne who doesn't retire early
NIGHTOWLOne putting off retirement as long as possible?
NIGHTOWLMidnight oil burner?