I think I'm seeing hallucinations..?

I was sitting down in my living room, and there's this opening from the living room to the den. I could see my dad watching the news and I'm all the way on the other side, lights are closed but it's also slighting sunny so I just wanted the sunlight, and I went back to doing my coding, and I see a man walking, and it was more of a skinny tall guy with some sort of top hat? I guess? and he walked from one end to another, see I didn't really care as much b/c when you move your eyes to fast in one direction to another it looks like somethings there so I didn't think much of it, and I'm back to doing my coding and now this man went from left to right after he went from right to left and that gave me shivers, I didn't say anything to my dad yet. I stare at the distance where my dad is, and I then face my left, and to my left is an opening to the front door and the stairs upstairs, but then you could see the dining room from my seat, and the man he's sitting down on the chair facing me, and I scream, my dad came to me and asked me what happened, and after I told him, he said I was going crazy, and went back to the news, and I said to myself that he's probably right, and I look to my left again, and there he is, in the dining room sitting there, he gets up and there's an opening from the dining room to the kitchen and I watch him leave. I told my mother about this, and she says my eyes are playing tricks on me, but why did it feel so real?