night owl

from WordNet (r) 3.0 (2006)

night owl
    n 1: a person who likes to be active late at night [syn: {night
         owl}, {nighthawk}, {nightbird}]

from The Collaborative International Dictionary of English v.0.48

nightbird \nightbird\ n.
   A person who likes to be active late at night; a {night owl}.

   Syn: night owl, nighthawk.
        [WordNet 1.5]

from The Collaborative International Dictionary of English v.0.48

nighthawk \nighthawk\ n.
   1. A person who likes to be active late at night; a {night
      owl}.

   Syn: night owl, nightbird.
        [WordNet 1.5]

   2. (Zool.) Any of several mainly nocturnal North American
      goatsuckers, especially {Chordeiles minor}, or the related
      European goatsucker {Caprimulgus europaeus}, also called
      the nightjar.

   Syn: bullbat, mosquito hawk.
        [WordNet 1.5]

from The Collaborative International Dictionary of English v.0.48

night owl \night" owl`\ n.
   A person who likes to be active late at night.

   Syn: nighthawk, nightbird.
        [WordNet 1.5]

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