Being scared as a child!

In the early 70's I was a kid in a small town in the Northwest. It was a hot summer night and as a middle class family we did what we could to keep cool. We would have all the windows open with box fans bringing cool night air in to cool the hot house. We also would have the front and back doors open with the screen doors closed. One night I was passing from the living room to the hall on my way to my bedroom that was located in the rear of our house. When I looked down the hall and out the back door. I saw a man standing in the door way. He was see through and you could only see the upper half of his body. I ran and got my mother and she could find no one. This happened dozens of times in my time that I lived there. I never understood what this meant and what I was experiencing. I thought that I was going crazy. This is just one of my stories.