Two lifelong friends with shared childhoods must navigate coming of age and the inevitable challenges to their relationship. The complicating factor is that they are boy and girl. My best childhood friend was a boy also, so I connected with this pair. Growing up is hard enough, but a frightening illness affects them both. This book gives insight about KLS, or Kleine-Levin Syndrome, which causes Oliver to fall into long sieges of deep slumber, lasting weeks at a time. Althea must find a way to reconcile her deepening feelings for him with the fact that they are not exactly mutual, and also deal with managing to go on in the face of his illness and absences. By the end of the book both characters have learned a great deal about KLS, their relationship, and their unfolding futures. I liked the ending, which is open to interpretation and also offers hope for both of them.