I remember my first scary movie experience, but now looking for the title. Anybody know it?

I saw it when I was a kid, and even then it was an "old movie". It was something about invaders (probably alien, but perhaps just supernatural) and the entire special effect being used was a simple flashlight, shined on the wall to indicate where the "scary thing" was moving. I specifically recall it hovering on the wall over someone sleeping.

Traumatic at the time, but now I want to see it for laughs.