I had one last night, about trains. The memory of it is very vague now but I woke up terrified. I remember living with my mom and her making me feel guilty about past things, so it's less 'nightmare' and more 'dredging up memories and being forced to relive them' type of dream. At one point, the train we were on was about to collide into another train while at the same time, I knew our train was lost, that it was no longer on the tracks. It was just floating, waiting for that other train to hit it. x_x