A.
This has happened to us a few times, and I figured out for us that turning on a favorite movie worked. I would carry my daughter to the living room (after I had gone in and turned on Barney or whatever it was at the time) and wait for her to come around. She almost always did, and then she would usually want a sippy cup of milk, finish the video, and she would go back to bed. I knew that if I tried to wake her, it would not go well, but for some reason, coming around to a movie did the trick. I know it is hard, but be assured that as long as she is safe in her surroundings, you can go to sleep when the episode is over. There is some speculation that it can be casued by changes in her routine, or even exposure to a movie or scene on TV that scared her. Once my daughter saw a preview for CSI and had a night mare about it, and I figured out another time after she had been having terrors for about a week, that she had seen a Disney movie and something scared her on that (It was the organ on Beauty and the Beast Christmas....go figure!) I wish you the best of luck dealing with this, I am sure that you are TIRED!! ~A.~