What does it mean when you dream of a ghost or demon?

i dream that i was in my room and the light was on and i was awake and then all of sudden my closet door open and the light and so i got scared and push it to close and then it opend agin but the this time i cld hear something so i said close the door!?and it did.and my grandma was there with me sleepin also and she woke up and said tat she heard it too and saw it so then i got scared and started crying so i went to my parents room N woke up my parents and told rhem about it and so then my mom read to me a paasage of the bible and i woke up