Ego- A defense mechanism that is partly conscious and contains the capacities to calculate, reason, and plan. As the Id relates to internal events, the Ego is occupied with the external world. Its task is to regulate and control the instincts provided by the Id. However, in times of sleep, the ego detaches itself from the outside world and changes its organization. The prime function of the ego is determined by the individuals experiences. The ego is the surface of the personality, the part you show the world. The ego is governed by the "reality principle ," or a pragmatic approach to the world. For example, a child may want to steal a cookie from the kitchen, but will not if a parent is present. Id desires are still present, but the ego realizes the consequences of brazen cookie theft.
Ego loss is not characterized by a 3rd party style detachment because you cease to exist as your identiy is stripped away. Instead it is a loss of reality in which you are reduced to Id; basic and instinctive subjective reality.
well, that's my take on it anyway. i'm probably wrong.