I go to bed pretty late
Same here.  I'm a bit of a night owl.
What do you think causes someone to be like this
Some people like to create habits like an owl!  That's where the term comes from, people up when owls are up lol.
I see. Is there any medical factor against it?
Some night owls may have a disorder involving there sleep phases.
i see. But i like what i am. Is there any therapy if you want to stop being a night owl
Excuse me, their* sleep phases.  Had to correct my grammar.  I think some people are just "A People" and some people are "B people" when it comes to sleep.
It is ok. Have you ever been a night owl ever since you were a child. I started this as a teen
Yes, I've been a night owl since I was a child, staying awake until just before dawn.