Ghost, entity,....alien?

[Moana]

So I just moved into my house which isn't even 10 years old, and I don't know what I experienced. I was up late around 1-2 a.m. Watching t.v. Because nursing my son ( 10 months) has my sleep cycle out of wack. My couch faces the t.v. And I can see down the hallway in the same direction. I suddenly felt afraid and that I was really about to "see" something. My nerves were on edge. I have never whitnessed anything paranormal and so I was really getting terrified. Out of nowhere, I see in my head this image of this very tall, shadowy, gray thing pop it's oblong head (with no facial features) from the back bedroom door like as if it looked at me and went back in the room. This really freaked me out so I just kept repeating to myself in my head ..." No, no ,no... I don't want to see that, I don't want to see that, I'm not ready to see anything" and that was it. After that the "feeling" of fear left and I did Not see anything physically with my eyes. Did I see something with my "minds eye"?