Dream of chased

Im being chased by a dark shadow like creature through a dark alley that is connected with other allys in almost a maze like figure, the whole time im running i am trying to scream for help but when i open my mouth nothing comes out, there is just silence. like i have no voice and even if if did no one would hear me. as i come to the end of the dream i take a turn and it leads me to a dead end, with no where to run and the creature is right about to catch me, i give up and the creature grabs me then i wake up this is a dream that i have at least 2 times a week every week no stop for about 5 years