night owl 
noun informal
A person who is habitually active or wakeful at night: dedicated night owls may retire to the late bars...
- I had a lovely conversation with his mother, my grandma Susie, on the phone today, and, thanks to the magic of instant messaging, just now wished my mum (who is a night owl like me) a happy mother's day.
- ‘Because of the nature of my security business, I am a bit of a night owl and my company's name is Night Security so I combined the two to come up with the title for the new CD,’ he smiled.
- There is also a worthwhile network of night buses, especially in the centre of London which for the night owl are both frequent and comprehensive enough to be of real value.
- faldstool
- fale
- Falkirk
- Falklander
- Falkland Islander
- Falkland Islands
- Falkland Islands Dependencies
- Falklands War
- f-all
- fall
- fall about
- fallacious
- fallaciously
- fallaciousness
- fallacy
- fallacy of composition
- fall afoul of
- fallalery
- Falla, Manuel de
- fall apart (or to pieces)
- fall at the first hurdle
- fallaway
- fall back
- fallback
- fall back on