The latest research appears to offer a glimmer of hope to people who have narcolepsy, for having found a correlation between narcolepsy and low hypocretin/orexin levels in the cerebro spinal fluid of narcolepsy subjects, it suggests a possible answer to what was seemingly an incurable condition.
For some scientific references visit:

http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1279673

http://jnnp.bmj.com/cgi/content/abstract/74/12/1667