Just saw a shadow pass through my bed

There's a paranormal phenomenon known as 'shadow people'. Shadow people might be ghosts or they might be interdimensional beings or they might even be aliens, no one knows for sure.  Of course, I'm not sure they even exist but a lot of people have reported seeing these things.  

How big the mass, how close to the ground? Did you see it "out the corner of your eye" or did you see it straight? How fast would you say it was moving? How long did you see it for? Was it day or night? Was it dark in the room? Was it cold or warm in the room? Did you notice any sound or smell? How did you feel during and after the observation? (any sort of 'lingering' sensation/feeling?) IF you did see 'something' and you didn't just 'imagine' it somehow, all those and such questions are relevant.

I've heard and read of people who have experienced similar things. Some people say those 'things' are things of nature which are usually not easily seen.

Unless you 'thought' you saw what you describe and it wasn't real, maybe it was one of those 'things' after all. I'd be watchful or alert if I were you.

I remember staying the night at my cousin's house when I was around 7 or 8 years old. We were all sitting in the living room watching tv and I heard my aunt whisper to my uncle, "there's is that shadow again." I noticed they were looking into the next room. I looked over and there was a person's shadow walking across the room.

I told my mom about it to see if she knew anything about it because she grew up in the house. It was my grandpa and grandma's house and my aunt got it when they passed. My mom told me that a guy hung himself in an upstairs bedroom back in the early 1900's. It was the same room that my cousin lived in. I remember that room was always freezing cold. I also recall always having a feeling that I was being watched when I was in the house.

The surface of your eyeball is actually an ocean of saline filled with microscopic debris. Sometimes one of those pieces of debris is closer or further away from your iris and seems like a dark object crossing your vision.

The truth is that we/you will never really know. There's not enough information.

Well, this thread is almost four years old so the OP is almost certainly dead, but the correct answer was indeed Shadow People.

But grandma's been dead for 10 years!