I think this is what DD is suffering from.
She's waking in complete fear of something. I'll come into the room and she won't even acknowledge I'm in there. Once when I went in, she was screaming trying to get away from me and shouting "help mummy" at the same time. She has had this about 5 times in the last few months. It seems to last about a 10 minutes until she comes round and then she seems confused and doesn't seem to know what has upset her.
It's really awful to not be able to comfort her. Has anyone else experienced this or does anyone know what could be causing this? Is there anything I can do to help prevent it?