Examples:

• Henry was a night owl.
• It seems that the little boy is somewhat of a night owl.
• I'm a night owl.
• I've always been a night owl, probably because I like the tranquility of night.
• Would you consider yourself a night owl? - Well, I am not a morning person. That's for sure.
• When do you do your homework? - I'm a night owl, so I do it late at night.
• Who’s the last one to go to bed? You or your husband? - My husband, who's a night owl.
• Most people remember this for Shrek; to me it reminds of the scene from Watchmen in which the Silk Spectre forgets about Dr. Manhatan and has fun moment with Night Owl. Interesting scene and interesting actress.
• Who's incredibly attractive, a real night owl.
• Except Hans is... something of a night owl.