What is Kleine-Levin Syndrome in the novel, Althea & Oliver?

Kleine-Levin Syndrome is a sleeping sickness which causes patients to sleep for extended periods of time. There is so much that is unknown about it and it has no cure and no real way to manage it. It usually occurs with young men who are just beginning to learn who they are as people. This symbolizes the volatility they are already feeling about their lives because it strikes with not much forewarning and leaves the patients feeling very vulnerable, frustrated, and angry.