Under the Moon — Deborah Kerbel

Lily MacArthur has never been much of a sleeper, but since the death of her Aunt Su, she's lost the ability to sleep completely. Night after night she goes to bed and waits for the sun to rise, without catching a wink of sleep. As she pushes people away by day, her closest friend becomes the night-time moon. Looking for a way to spend her sleepless nights, she slips out of the house. She meets Ben, who works the night shift at the local drive-thru. A newcomer to town, Ben has a troubled past -- and future -- that he keeps from Lily.

As Lily's sleeplessness begins to destroy her health, she has no idea that Ben holds the key to finding her sleep and saving her life. But first, she has to find a way to save his.