Have had a rather strange experience myself.
There was one day when I just started to feel bad. Weakness and just felt damn friggin awfull. Also noted kinda like a dhunla paan in the house, though I thought that might have been low voltage (which it wasnt, 220-225V at stabilizer).
Went to my living room and noticed a very peculiar breathing sound. Thought it was my imagination. Sat around 10 minutes listening to something breathing. If I went and got someone in the room, it was gone. Alone and back it was. Prayed ait-ul-kursi three times. Everything went normal. Weakness gone, mood was alright and no noises.
My father noticed someone ... 'sitting' in the same room.
Never had any problems in that home over 8 years though. So no idea ... nothing happened later either.