I wanted to thank those who suggested melatonin and wish I'd stumbled upon it sooner. We started giving DD8 about 2mg 30 minutes before bedtime and I don't think we've heard "I'm scared" or "I can't sleep" from her room for a week. She still wakes up around 3:30 every other night to sneak into our bed, so maybe we need to up the dosage a bit.