I've had sleep parallysis a few times, usualy when I wake up in the middle of the night or early morning. It's no biggie, just need to wait it out.
My little sister has has night terrors, I can remember as a kid having her get up out of her bed and run into my room crying and sort of talking (But really mostly just babeling incoherently) and not really responding to anyone saying anything to her, and after that she'd eventualy snap out of it so to speak and not remember any of it. (During the 4th stange of sleep in which night terros take place, the body is not paralized like they are during REM, so people who are experiencing them are able to get up and run around like lunatics. In more gullable nations, the "night terror" defence has been used to find people innocent of murder, and to attribute the motivation for sudden suicides).