A lark, early bird, or morning person is a type of person who gets up early in the morning and goes to bed early in the evening.
A night owl, evening person or simply owl, is a person who tends to stay up until late at night, and is the opposite of an early bird.
– WIkipedia
Personally, when it's a weekday, I wake up early, of course, and go to sleep at at least 23:00. But when it's the weekend, I tend to wake up at 10:00-12:00 and sometimes even 13:00, and then stay up, sometimes even until 3:00. Many people do the same, yet you will always find that one person that wakes up at 6:00am and goes to sleep before 21:00. Always. And my father is one of those people. And since he married my mother and started waking her up when he wakes up, she's one too.
What about you, NSG?