First of all this type of cinematographic nightmare is a theme. Somehow the client is not aware of a serious form of 'sin against the order of God' and is denied his peace and paradise. Some type of demoniac possession takes it over from the rule of goodness and makes the evil stare of war against humanity and human love. Always the lovelife of the victims of the alien force is destroyed. Paranoia takes over.
Murder takes place.
Possessed people become the servants of the evil empire etc. What is this strange intelligence that sets up people against oneother. No strange creatures, no odd non-existent spaceships. Just some astronauts fixing a satellite that get 'infected' with all hell on earth as a consequence. To analyze this recurring nightmare we must return to the content of the dreams and try to figure out what the happenings mean symbolically.