Because the memories don’t ‘feel’ real. They are different from other types of memory. (It will take me several years more to discover that traumatic memories are indeed a different kind of memory, being mediated principally by the amygdala rather than the hippocampus). Sometimes they are ‘there’ and at other times they aren’t. They seem to dance in the shadows in my brain. Surely this isn’t right, or normal, or sane?