The trauma is always hunted humans in different ways and situations. The is no exact reason for the cause, but when this physiological disorder happens in kids its very disturbing for parents or public, as the behavior of child is different from others. The one reason I could say is, children suffer from such disorders when they are in the womb and some starts after watching events which are not meant to, if a child watchs someone firing and killing, or if the child’s parents fight all the day and get divorced..Children memory is very blank and calm, when they see such events, the images are never removed, and they feel that every now and then, they feel something important is missing, scary.
This is just not with watching things, but also habits, today parents have developed a bad habit of staying long nights and enjoying night parties, which effects there sleeping habit and directly effects children. After a research I have found that, 60% of children in world today are getting a physo or criminal minds, this is all because of insufficient sleep they had when young, when young children who are not active in mornings are advised to sleep until they themselves awake. My suggestion to parents is to change the habits and make children sleeps at least 8-10 hours.