Are you a night owl?  do you tend to stay up until late at night?
Yes, I really am a night owl.  I usually stay up too late and am tired the next day.
Me too..I just can't go to sleep early it seems.  The opposite of a night owl is a early bird.  someone who wakes early and goes to bed early. 
I would not consider myself an early bird, besides the weekdays when I have to get up early to go to work.  I am not disciplined in going to bed early.
In many different countries especially Scandinavia early birds are called "A people" and night owls are called "B people"
That's interesting.  The night owls jargon was derived from owls because they are nocturnal.
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.