a few questions

i've written in this section before about a few experiences with what i thought were spirits. well since then i haven't really experienced anything in the way of what i did then and i just have a few questions for those of you that are a bit more experienced in this stuff.

i have been told before that if you feel ice cold and a shiver up your spine that, that means there is a ghost in that spot..is this true?, is that a way to tell that they are there?, i have had a couple of experiences on and off on the train, once for a bunch of stops, one whole side felt ice cold and it was only that one side, there was no one sitting next to me and no air conditioner on and it felt like it was sitting in the seat next to me and then after those stops, it was gone and i felt warm and normal. then today, i was on the train again and then after a certain spot i felt ice cold and this chill went up my spine like i hadn't felt before and it felt like the cold air was sitting on me, when i got up to leave, the cold was gone and i know it wasnt the air con cause i sat in the same seat, in the same spot for the whole trip ... maybe its nothing but just curious.

and last night i was drifting off to sleep and i saw this what seemed to be an image of a woman, with just over shoulder length hair and in a strange dress, i reopened and closed my eyes and she was gone. maybe that is nothing too, maybe me entering dream state, but could it be something?, i was also told that when you are off to sleep and dreaming, is when the mind is open to seeing these things.