DD1 is nearly 4 and regularly (once a fortnight maybe) wakes up in the night crying but is incoherent and inconsolable. Sometimes she is upset over a (relatively) minor incident (e.g. this weekend we were camping and last night she was inconsolable, but mentioned something about a spade that she had lost that day). We have no idea how to prevent it or snap her out of it. Any one else have any experience with this?