D. All of the above. Nightmares can cause a number of physical responses that the sleeper would feel facing a real threat.
A. True. Unless they’re post-traumatic-stress dreams forcing you to relive trauma, garden variety nightmares can help you pinpoint anxiety triggers or deal with real-life scary situations.
C. It’s complicated. There are certain techniques that might help control your dreams, like thinking about positive imagery as you wait to fall asleep, but the occasional nightmare might still slip through.
C. How they look human, but not human enough. This is referred to as the Uncanny Valley, where a humanoid figure looks just off enough to be creepy.