I am the daughter of a night owl and a grand-daughter of a night owl. My children are also night owls. It is truly a genetic strain. It can also be a strain on a relationship, especially if your partner is a day person. Day people do not understand night owls. Any activity after midnight is a deliberate assault on their person. Night life is definitely much quieter, fewer distractions (eg. meals to prepare) and thus concentration is uninterrupted. Besides, my brain seems to get what must be akin to a caffeine kick around midnight. It is very hard to try and sleep when your mind is abuzz with ideas and concerns.
My husband believes that I am a worry wart and I suppose he is partially right. If I am not tired enough to sleep, I spend my time thinking about other concerns.