When I scream in my dreams, I fully expect to wake up in the morning and have my roommate tell me that I woke him up at four AM. I have, and I'm sure we all have, experienced kicking the game winning field goal and waking up with a broken tow and a hole in the wall. It must be something to do with not being in a deep enough sleep. My sleep has varied from severe unconsciousness to daydreaming in bed for seven hours. Even in my lighter sleep, I still can't figure out why I end up screaming.