I like to stay up really late - I am certainly  not a morning person - I am a night owl!  How about you?
I am not a night owl. I guess i would be considered an early bird or someone who wakes up early.
I like how peaceful it is at night - that's when I do my best work!  I wonder where the term "night owl" came from!
The term night owl comes from the nocturnal behavior of an owl.
That makes sense!  I guess you don't see too many owls during the day!  haha!  I have actually heard owls at night when I am working!
Generally, people who are night owls are awake past midnight and then there are extreme night owls that stay away until dawn.
I don't quite stay awake until dawn, but close to it!  The sun is just peeking over the horizon when I go to bed!
night owls may stay awake until just before or even after dawn. Night owls tend to feel most energetic just before they go to sleep at night. 
Some night owls have a preference or habit for staying up late, or stay up to work the night shift. Night owls who work the day shift often have difficulties adapting to standard daytime working hours.
Night owls have often been blamed for unpunctuality or attitude problems. Employers, however, have begun to learn to increase productivity by respecting body clocks through flexible working
Night owl (person)
A night owl, evening person or simply owl, is a person who tends to stay up until late at night, or the early hours of the morning. Night owls who are involuntarily unable to fall asleep for several hours after a normal time may have delayed sleep phase syndrome. 
The opposite of a night owl is an early bird – a lark as opposed to an owl – which is someone who tends to begin sleeping at a time that is considered early and also wakes early.