My daughter started this at 9 months...and it scared the *&^% out of me! It was awful! Lasted about an hour and it looked as though she was awake, but not responding to anything my husband or I did, said, sang...nothing! She was having night terrors. Now, what I am going to tell you is distressing...trying to wake her from it and help her could actually make the night terror worse and last longer. Our pediatrician said the best thing for her was to leave her in the bed and hold her hand and talk to her...letting her know she was safe. It's awful, but it will get better. She wakes up still during the night (she will be 4 in a few weeks), and occasionally it is from nightmares. Again, the dr. said this was normal and it would eventually fade away as she gets older. I am hoping she is right! Sitting by watching her was miserable (still is when I hear her cry out in the night), so I can only offer you empathy. Let her know she is loved and that you are there, that may get through to her while she sleeps. The other thing, and I know this sounds funny, but we saw an episode of Blue's Clues that dealt with nightmares and how, since they are your dreams, you can change them. (This was when she was older) When she wakes with a bad dream now, we can talk about that episode and she will tell me what was bad and together, we will make it something good. She still doesn't sleep through the night as she is also restless, but I am noticing the night terrors are gone and the nightmares are lessening! One more thing worth mentioning, our dr. said that being overtired could trigger a night terror, also. I started to notice that we had more issues if she was off schedule or overtired from the day! Good luck, and I hope this phase passes quickly for you!