Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Kleine-Levin Syndrome or KLS or Sleeping Beauty Syndrome) is a neurological disorder characterized by recurring periods of excessive amounts of sleeping – between 16 to 22 hours a day. At the onset of an episode the patient becomes drowsy and sleeps for most of the day and night – hypersomnolence – waking only to eat or go to the toilet. Someone suffering from KLS have sleep episodes which typically last between one and three weeks, with coinciding cognitive disturbance and childish behaviour in the few hours of wakefulness. KLS is a very rare syndrome with 1 out of 1000 sufferers worldwide... Learn more about Kleine-Levin Syndrome, its symptoms and parts of the brains affected by it with this book.