I fantasise about things too, maybe a little different to what you mean though, I tend to find myself imagining I've been in situations where I've been attacked (I won't go into the details of it incase it's a trigger for someone) or there are ghosts in my house, just really bizarre stuff. Not so much ME doing these things but someone else. Perhaps the fact I'm really hypervigilent about these same things has something to do with it.