When my daughter's dp/dr started it came accompanied by night terrors, sleep walking, the nightmares-so-real-were-they-hallucinations question, and severe and prolonged paralysis upon waking
This is 'classic' ASP - Awareness During Sleep Paralysis. Apart from being scarey, it is compltely harmless. It is almost certainly not an indication of something more serious. I've had it since I was a child, and almost everyone experiences it at least once in their life, usually without knowing it. Most of the time, they think (people of, er, certain countries) they are being abducted by aliens/demons...etc.....
I won't go into detail here, but surf the web for sleep paralysis and hypnogotic hallucinations. Ignore all the spooky/spiritual/supernatural stuff that you might find, it's bollocks.
Good tips for avoiding it - make sure your daughter doesn't take naps, and get's a good eight hours+ night sleep, uninterupted. Over stimulation and, bizarrely, over-tiredness, can also trigger it off.
Please don't worry. It's just a small hick-up in the sleep process. When you are asleep, your body is naturally paralysed (so you don't trash around and hurt yourself), but with sleep paralysis you 'wake up' in the middle of it.