#3 Narcolepsy?!?!?!

They think it is caused by lack of hypocretin. They don't know how to measure how much hypocretin you have or what amount of it you need. Hypocretin is a chemical in your brain that helps tell how awake you are. Heredity doesn't decide alone if you are narcoleptic but you also need to have one of the following: infections, brain damage, immune system damage, and low histamine.