I read a theory on why we dread... it stated we evolved to dream to "practice" for dangerous events in primitive life... like dreaming of being attacked by a predator of sorts... dreams are often manifestations of our fears and anxieties... you probably feel a strong fear of scoial rejection, and your brain may be trying to prepare you in case these fears arise in the waking life... I have many dreams of dirty disgusting public restrooms and I wake up with severe anxiety...