I've been a night owl all my life. I'm always up late at night.
Same here!  I usually stay up until 2 AM!
I'm usually up until 4AM! I could never be an early bird. I can't go to bed or wake up early. I've tried!
Wow!  You are a night owl!  What time in the morning do you have to wake up to be considered an early bird?
Someone who sleeps at a time that tends to be considered early by most in the same time zone are typically called early birds.
I think a lot of older people are early birds.  One of my older coworkers told me he wakes up at 4 AM.
In some countries they call early birds "A-people" and night owns "B-people". Pretty weird, huh?