This is my personal experience when I was 7. Thinking of it now, I realize that what the elders in our province used to say may be true after all, children of pure innocence can see the unseen.
Our house is a 3-bedroom bungalow where I shared a room with my sister. My bed was located about six steps from the bedroom door and it was positioned in a way where I could easily see what or who was outside, especially in the kitchen next to our bedroom. My sister and I always slept with the door open, so at night before closing my eyes, I would always get a glimpse of the kitchen.
This particular night was something I've never forgotten to this day. I was about to sleep when I thought I saw shadows in our kitchen. There were two, rather small and moved from one kitchen wall to the other. The shadows were moving quite fast, too fast for a normal person but not lightning fast. It seemed to me that they were looking for something in the oven, since I could tell their shadows would always stop there for a few seconds then move again to another part of the kitchen. Oddly, I wasn't hearing any clattering at all.
I wasn't scared, in fact I was curious. At first I thought it could have been my brothers, looking for something to eat. But I realized they couldn't possibly move that fast. So I thought it could be the curtains dancing with the wind, but the movement was so erratic that it was impossible to be curtains. Recalling all the cartoons I've watched as a kid, it occurred to me that they might be dwarves.
I wanted to stand and take a look, so I sat on my bed, mustered the strength, but then something in my mind was telling me not to. So I just sat there for a good minute, looking at our kitchen, watching the shadows as they moved around. My sister might have felt that I was still awake, so she shushed for me to go back to sleep. Being scared of her, I lay down, faced the wall and closed my eyes.
I never found out what or who those shadows were but I never thought it would take 4 years for another experience to bring me back to that night. Well, that's another story.