I see things, shadows, in my peripheral vision, and sometimes hear noises like someone is in the house even tho I know I'm the only one in it. It took me years to get used to it. I thought I was crazy at first, seeing stuff that wasn't there, but then I heard other bipolar people say they had the same thing happen, so I decided it must be normal. Now I don't worry about it so much. Sometimes I will find myself looking twice at something out of the corner of my eye, but realize it's not really there and ignore it.