IA. I've thought for a while that the "spaceman" she was talking about was actually the Doctor, but I hadn't seen how that could apply to her reactions in LKH. Makes perfect sense. And it's something a lot of kids experience, I think - being terrified, and not knowing why. Just feeling like SOMETHING is out there in the dark, that wants to eat you. And Moffat is always pulling from childhood stuff like that.