Three times this week. at different times, my DD with no warning has started screaming at the top of her lungs a terrified sounding scream with no build up. We've been in and comforted her, and she's not been too difficult to get back to sleep so I don't think it's teething or illness. She is definitely awake although only half iykwim. It's taken 15-30mins for one of us to get her back to sleep so not up all night or anything but I am still finding it odd as she is usually a reliable sleeper on the whole. Is this the start of nightmares? Has anyone experienced soemthing similar?