One time I had a very immersive zombie experience, I was basically myself, just a few months after the outbreak. First thing after stepping into that dream was seeing a scavenger trip a car alarm and get ripped to shreds by running zombies. Into that dream I had to make a supply run with a friend, killed a few amount of zombies, avoided most of them, but got chased a lot. Thank goodness my brain carried over my real-life parkour experience into that dream. Got my friend killed and had to sneak around alone in an underground train station with a shit ton of zombies. Eventually made it back but not after many close calls. Honestly, Ive never felt so much fear before.