"Figures in the Dark"

Have you ever walked around your house at night without the lights on?Well anytime I go downstairs to get a drink I always see human figures out of the corner of my eyes.Sometimes I even hear them.Sometimes I fear they are the devil's deamons trying to steal me away into the darkness that never recieves daylight.I always turn on a light before I enter a room so that I am sure they cannot hurt me.I don't believe it is my eyes playing tricks on me unless, I ONLY SEE THEM AND NOT HEAR THEM.