I consulted the UESP and the Beginner's Guide on the issue, because both occasions have been very weird: I never had a dream, and in all cases I became a vampire after reaching my destination - in a normal manner - I should add. Furthermore, I have slept plenty of times, and I didn't see a single bad dream... This arises questions. First, the UESP says you can contract vampirism through "cursed" items. Never mind the fact that I got Critical Weakness to disease and got attacked by vampires, which I'm sure is the cause, I would like to be further enlightened on the issue of being "cursed" with items because I looted a few enchanted ones from vampires. I'm "quite" sure that being bitten was the culprit of my disease, BUT the circumstances through which this happened are quite mysterious - the Beginner's Guide for instance says I would either wake up in a random dungeon or get to my destination only if my travel was about three weeks enough, which is evidently not the case here. Furthermore, there's still the lack of a dream - dunno if it's a bug or a problem with playing DF with Dosbox, the intro video also doesn't seem to work well for me.