I am married, going on three years, and my BPD has been in full swing the past year.  I've noticed that I can dehydrate because I avoid going downstairs for water if I'm thirsty in the middle of the night. I feel like if I can't see in the pitch black then there may be someone who broke in and is sitting there watching me.  I know it's irrational, but I am going to keep a gallon of water next to my bed so I don't dehydrate anymore.  Can anyone else relate?  I feel really panicky, jumpy, and get sort of tunnel vision, just full of hair-raising fear when I'm downstairs in the dark.