Yes you do specially where there is a kind of fear in your mind. If your inner power is strong enough and you do not fear of anything then such thing does not happen.

yes when im in the shower whenever the door is closed. Just right now me and my friend hear a knocking when were by ourselfs at home. And i do see objects out of the corner of my eye its freaky!!! but

We all have an extra sense that is alerted when someone is watching us, this is a proven fact, its not to do with fear although it can be scary if you are feeling unnerved at the time. I'm sure you have sensed this before, looked up and found someone looking at you.Try it, look at someone and see if they spot you.