Why would they show themselves to humans if they don't like being seen? It just seems counter productive. Even if they aren't evil, they have a job to do, we have lives to live on. Why freaking scare us and haunt us humans when we would like to live in peace. Even if they fed on my energy at night, I don't want to know about it unless I can do something about it...well, I guess that makes me a coward. Either that or in despair.