Along for the Ride by Sarah Dessen

It’s been so long since Auden slept at night. Ever since her parents’ divorce—or since the fighting started. Now she has the chance to spend a carefree summer with her dad and his new family in the charming beach town where they live.

A job in a clothes boutique introduces Auden to the world of girls: their talk, their friendship, their crushes. She missed out on all that, too busy being the perfect daughter to her demanding mother. Then she meets Eli, an intriguing loner and a fellow insomniac who becomes her guide to the nocturnal world of the town… Read more.