Woke up crying from detailed dream

So I dreamed I was trapped in a house where people had to kill each other to get out and there was kids . A little boy witnessed his steps death in the upstairs and was trying to carry her body downstairs and was crying . I didn't know the boy or his sister but they were like 9 or 10. I picked up his sister n carried her the rest of the way n laid her body on the ground and I began to sob . I sobbed so hard I was screaming and next thing knew I woke up crying.