This reply isn’t from an SI perspective, but more from a lived experience point of view and just in addition to Katie’s brilliant response. I used to have night terrors as a child and adolescent (and sometimes still do as an adult depending upon how much stress I’m under). My eldest son also had night terrors as a toddler during big developmental milestones (again, probably will do throughout the rest of his life if he’s like me), and I now understand how scary they can be for parents when you don’t understand what’s going on. My husband was very worried when our son would wake up in middle of the night screaming for the best part of an hour without anything comforting him, and I can completely understand how hard it is for parents to see that level of distress in their child. However, from my personal experience of night terrors, I never really remember having them at all. I looked awake, but I was fast asleep and didn’t know what was happening at all - I was more confused by how upset my parents were when I woke up! Knowing this as a parent helped me to be grounded and allow my natural parenting instinct to come through. What I found to be most helpful for my son was to sit with him and hold him through the tears and screams. It’s really hard to stay grounded as a parent when there is that level of distress, so maybe (like Katie said) sensory spiders might be helpful for parents - especially to think about what keeps them calm when the terrors are occurring and so they can be the grounded individual to support co-regulation. My personal calming strategy was to send my husband away, as I couldn’t deal with his panic and also stay calm for my child! I completely appreciate how much of a challenge this will be for the family you work with. It does very much impact sleep and can create more stress and anxiety around what night time will bring, which in turn then fuels night terrors. My son did stop having night terrors after about 12/18 months and my husband became much calmer when our youngest started having them. My youngest only had the odd one or two, and not really as intense as my eldest, but my husband was able to deal with them, as he had a better understanding of their being developmentally normative for our children and something that would pass with time.