What does my dream mean.?

I had a dream as if my little sister was playing in a garden with another baby, who i had a bad feeling about. And as time went by, I saw my sister look worse and the other baby look better. Then my sister started to look like the exorcist and i got really scared. Then i somehow figured out that the baby that was playing with my sister was a demon and was sucking the soul out of her until she was dead. My sister was demonically possessed. And for some reason, this demon had an affect on other members of my family as well. When the demon would look at one of my family members and jerk his head, the family members head and back would violently jerk back so powerfully their back would break. The demon was also looking like the exorcist at this point. I also remember that i was the only one who could help my baby sister because apparently i was the strongest soul and could withstand anything the demon decided to do to me. And i remember laying on my bed crying (still in the dream) when i heard the demon chanting and then i knew he was preforming the ceremony needed to take the rest of my sisters soul. Then i walked out of the door and looked at the demon saying "MY SISTER!" I remember not being able to say it the first few times. Then I took my sister and saw that she was dead, so i hit and pushed the demon and every time i breathed, he would jerk his head and so would my family, and after that, I woke up breathing heavily and my chest was burning for some reason. Oh and also right before i woke up, when i was at the phase where you are still asleep but you're conscious i THOUGHT about defeating the demon by taking his eyes out and stepping on them, and when i did so, the demon would separate slowly turning into black smoke and black sand (or maybe it was ash). Please tell me what this dream means because it really freaked me out.