When I'm stressed at work, I have hideous problems sleeping: in particular, racing-thumping-heart and racing-thumping-thoughts when I'm trying to get to sleep, and then suddenly becoming WIDE AWAKE several times a night. I always remember my dreams, which are frequently nightmares, and often weird "recurring location" lucid-type dreams in which I'm in a place (a completely imaginary place!) which I know my way around and could describe perfectly - and draw a map of - once I wake up. I have about 5 locations I know very well (a couple of towns, a landscape, a wood...) and I've never heard of anyone else experiencing this. Of course, it makes running away from nightmare monsters all the easier, as I know where everything is!