Midnighters Trilogy
From Wikiquote
The Midnighters Trilogy is a series of young adult science fiction books written by Scott Westerfeld. As the title implies the series contains three books, The Secret Hour, Touching Darkness, and Blue Noon.
[edit] The Secret Hour
Jessica Day (refering to Jonathan's sandwiches): But three of them?
Jonathan: That's nothing. Some birds eat their own body weight every hour.
Jessica: Sorry, I missed the feathers on you.