I've been searching for an answer to what is going on with ds at night. It took me a long time to find a name for it. Everyone with whom I've spoken about it suggested that he is having night terrors, but from my reading, his behaviors didn't fit. I kept searching thinking that maybe it was different enough from night terrors that there may be something I could do to change it. I finally found a the term "confusional arousals," which fits much better. I thought I'd share this link, as it has nice descriptions of the common "dramatic parasomnias" as well as treatment (spoiler: there is no real cure but time, and in some cases they don't grow out of it).
Hope this helps some here who are struggling with troubling night time behaviors with their little ones.
I wish you all peaceful nights!