THIS IS WHY

Is this peptide a key to happiness?

What makes us happy? Family? Money? Love? How about a peptide? The neurochemical changes underlying human emotions and social behavior are largely unknown. Now though, for the first time in humans, scientists at UCLA have measured the release of a specific peptide, a neurotransmitter called orexin, that greatly increased when subjects were happy but decreased when they were sad.

Because Narcolepsy doesn't kill you, it makes you want to die.