Preethi-not had a nightmare.. not a nightmare, she had two nightmares in a row actually.
The first one being her seeing a ghost, something like a black cloth floating around and she got really scared, the second one was her and Ka Ren being stalked or something and Ka Ren was injected with some sort of drug/poison/disease and she was running and running and couldn't wake up although she tried to.
She said nightmares are bad omen because sometimes it came true for her (not exactly the same but something connected to the dream) anyway .