Does she have a night light in her room? Do you close the curtins or blinds for her at night? Do you have a dog or cat that could be in her room with her? I would imagine this is mostly a bad dream, nightmare type of thing. She will outgrow it eventually. Play soft soothing music in her room on a tape or CD player, leave her bedroom door open if it is currently closed or close it if it is currently open after making sure the window is tightly closed the curtins closed, etc. Make it an evening ritual at bedtime to secure first the house (have her come with you) to close and lock doors, windows, close curtins, lower blinds, then have her help you do the same in her room. Read her a fun story that is short, then turn on the music, make sure a pet (if you have one) is in the room with her, the nightlight on, and kiss her goodnight. If she gets up in the middle of the night and wakes you do the same thing, recheck all of the doors windows etc., put her back in her own room, read to her, put the music back on, etc.
I had a friend that went so far as to put a monitor in the child's room so the child when waking from a bad dream would call to them from the monitor and they could go to her room and show her everything was secure and she was safe.
P. R