I am a night owl and like to stay up late!!! Most of the time i stay up till 4 or 5 am.
i am the opposite, early bed early rise
I've never heard of an early bird, but night owls are called B-people in Scandinavia.  Hootie Hoot.
that's funny, a new way of describing it.
tend to have unhealthier eating habits.
Some night owls with great difficulty adopting normal sleeping and waking times may have delayed sleep-phase disorder. Morning light therapy may be helpful in shifting sleep rhythms for the night owl.
Factors.
The tendency to be a night owl exists on a spectrum, with most people being typical, some people having a small or moderate tendency to be a night owl, and a few having an extreme tendency to be a night owl. An individual's own tendency can change over
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.