I love to stay up late at night, you could call me a night owl
Oh yeah? I'm the opposite, I like waking up early and going to bed early
Someone who likes going to bed early and waking up early are called early birds
That makes sense, birds are always up in the morning
night owls may stay awake until just before or even after dawn. Night owls tend to feel most energetic just before they go to sleep at night. 
Some night owls have a preference or habit for staying up late, or stay up to work the night shift. Night owls who work the day shift often have difficulties adapting to standard daytime working hours.
Night owls have often been blamed for unpunctuality or attitude problems. Employers, however, have begun to learn to increase productivity by respecting body clocks through flexible working
up of the circadian timing system underpins the difference between early and late chronotypes, or early birds and night owls. While it has been suggested that circadian rhythms may change over time, including dramatic changes that turn a morning lark to a night owl or vice versa, evidence for familial patterns of early or late waking would seem to contradict this, and individual changes are likely on a smaller scale.
Prevalence.
A 2007 survey of over 55,000 people found that chronotypes tend to follow a normal distribution, with extreme morning