I used to have night terrors as a child and pre teen. It is the scariest thing one could imagine for those who have never experienced it. For myself I would be partially awake but unable to move hypersensitive to noise light and dark. The whole room would stretch away from me. The hum of the fan or the window unit would ramp up to a deafening squeal. The darkness would turn to a plague of spotted bugs and the light would flicker like a fire. All taunting and terrible, worse then any nightmare.