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.
Researchers traditionally use the terms "morningness" and "eveningness" for the two chronotypes or diurnality and nocturnality in animal behavior. In several countries, especially in Scandinavia, early birds are called "A-people" and night owls are called "B-people".
Etymology.
The term is derived from the primarily nocturnal habits of the owl. Most owls sleep during the day and hunt for food at night.
Characteristics.
Usually, people who are night owls stay awake past midnight, and extreme
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.