Night owl (person)
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For other uses, see Night Owl.
Night owl is a term used to describe a person who tends to stay up until late at night.
Owls, like this one in Poland, are often nocturnal.
The term is derived from the primarily nocturnal habits of the owl. Usually, people who are night owls keep awake past midnight and extreme night owls may stay awake until 5:00 AM or later.
Some night owls have a preference or habit for staying up late, or stay up to work the night shift. Other night owls, however, who have great difficulty adopting normal sleeping and waking times may have delayed sleep phase syndrome.
Preference for a dark nighttime world is called nyctophilia or scotophilia.
The opposite of a night owl is an early bird, lark as opposed to owl, someone who tends to begin sleeping at a time that is considered early and also wakes early. In several countries, early birds are called "A-people" and night owls are called "B-people". Researchers traditionally use the terms morningness and eveningness.