Theres a thread about night terrors
here
I thought I had replied to it but obviously not...
Maya has night terrors on occasion, I have no idea what causes them but she is still fast asleep crying, fighting and screaming. I've had to slap her in the past to wake her up coz waking her is the only way to settle her down. When she wakes she is fine, doesn't remember a thing and is just a little startled.
She does seem to have them less frequently as she gets older...