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They are night owls
Night owls are people who tend to stay up late even if there is no reason behind it. These people function better at night.
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They have things to do
People who are loaded with work or studying tend to stay up late to finish what is required of them.
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It’s more quiet
Some people like staying up late to enjoy the calmness and quietness, as opposed to the loudness of the day.
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There are no distractions
Some people find working and studying at night better, as there are minimal distractions.
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They have work
People who work night shifts, for example, are forced to stay up late, and even sometimes sleep during the day.
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They find it relaxing
Some people find staying up late to be relaxing, as they are usually alone and have time to be with their own thoughts.
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They are bored
There are people who tend to stay up late out of sheer boredom and the lack of anything better to do. (See How does staying up late affect your health?)
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They get home late
People who are not restricted by curfews have the choice to come home late, and consequently sleep late.
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They can’t sleep
Some people are incapable of sleeping early, which results in them staying up late until they feel sleepy. (See How to Have a Good Night Sleep?)
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It’s a habit
Some people have the habit of staying up late for no reason and find it hard to get rid of it.
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They are intelligent
Some studies have suggested that people who stay up late are more intelligent than others who sleep early, due to a certain energy that they have.
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Due to commitments
Some people are forced to stay up late due to having certain commitments, such as tending to an ill person or taking care of a baby.
