First of all, greetings! This is my first post.
I am not really a 'believer' in ghosts/the supernatural. Don't even really believe in god or religion. Call me a skeptic. Though, I do not claim to know for a fact that such things do not exist, and I do not know if I can, so I remain agnostic on these types of issues.
With that said, I did have a rather odd experience.
From time to time I have spent the night at my grandmother's house. It's an older, larger house in an old neighborhood in a big city, with lots of rooms upstairs and a large attic. Every time I have ever stayed there, I got a creepy/eerie vibe in the upstairs part of the house. The downstairs is perfectly nice, normal, and doesn't "feel" at all out of the ordinary. The upstairs is quite different, though I can't really put my finger on what exactly gives the weird vibe upstairs.
One night I was staying upstairs, in a particular bedroom that has always seemed odd to me anytime I had stayed there. This night was no different. When I went to sleep, and for the rest of the night, I had an odd feeling that there was some other presence in the room with me. And I had the feeling that this presence was directly in front of the bed. However, I dismissed it and tried to sleep.
Well, my dog was also with me this time, sleeping in the room with me. Normally he will sleep on the floor or just curl up in the bed with me and sleep (he's a sled dog type). Not that night. He basically spent the entire night in that room sitting at the foot of the bed, upright and alert, letting out a deep growl and staring at the wall in front of the bed. Occasionally during the night he would start barking quite aggressively at which time I woke up and tried to get him to calm down. No dice. This behavior continued all night. He had never behaved this way prior to this one night, and he's never done it since.
The next morning I was explaining this to my Aunt, who lives at the house. She tells me she once saw a "ghost" in that room and has never slept in there since. Her husband, a big gun guy, iron worker, and typical tough guy who is afraid of no one, slept in there one night and was freaked out and refused to ever sleep there again.