Not answering the questionas it seems to have been answered and explained in the comments, but I have a (hopefully) humorous anecdote:
My boyfriend is *very* skittish, and one night I must have have the same kind of random jerk in my sleep. I woke up to my boyfriend screaming out.
A half hour later the paramedics were round diagnosing him with a mild concussion. The silly twat had jumped so badly at my hypnic jerk that he fell out of bed and nutted the bedside table.
We laugh about it now, but I had a good few days of stank eye off him for that one. Ha ha.
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