In winter, when I visited my grandma's I had a really unexplainable experience occurring at nights. I live in Croatia, and my grandma is in Bosnia & Herzegovina.
My grandparents have a house that is connected to another one, which was where my grandpa's sister and her family lived. But since they don't live there anymore, that house is always empty and my grandparents now use it for when our relatives come to sleep over which includes me of course.
So I was sleeping there all alone in a small bedroom, where my grand-grandma died of her old age. She also always slept in that room when she was alive. I really didn't mind it at all. I liked to sleep there since the bed was unusually comfortable, even though it actually wasn't a bed but an old couch that could be taken out to make a small bed. I don't know how, but I would always be able to fall asleep even if I was not tired. It felt like I was in heaven.
One night while trying to fall asleep, I could hear silent yet clear breathing in the room. I wasn't that scared at first I thought it maybe the wind or something. But when I stopped my own breathing and focused on the weird noise in the room, I could hear it even clearer and a bit louder. I was starting to get really nervous, I thought it was all in my head, but since I was so scared I got up and turned the light on. It didn't stop. I could still hear it.
I was uncertain where the breathing coming from. I left the room and decided to stay in the living room and listen to music to let myself calm down and I hoped that it would stop when I come back. I couldn't hear anything in the living room. Then at 3 AM my sister came from the city, and I told her about the noise she decided to sleep with me (even though the bed was small, 2 persons could fit in it). After a few seconds, she told me she could hear something scratching in the room. I just think that she went a bit paranoid at that point (even if she's 4 years older than me), as I didn't hear anything.
However, my sister got so annoyed that she literally left the room and went to grandma's house to sleep. I went with her, of course, since I hadn't had intentions to sleep there after all. However, the next night, I was also alone in that room trying to fall asleep and I could hear it again. But I ignored it and fell asleep.
The funny thing is, whenever someone was in the room at night with me, I couldn't hear anything. I told my brother to visit at night soon after I went to bed so he could hear it too, but when he came there was just silence. About 5 minutes after he left it started again. I was so freaked out. I know it doesn't sound like big deal, but I could hear it clearly, it was breathing, not my own because I didn't even move a muscle and held my breath while being so concentrated. I became annoyed that I even shouted "Stop it, now!" Yet, still, I could hear the sharp breathing cut through the small room.
The whole week I was trying to figure out what it was. I usually never believe stuff like this. But I couldn't find anything that could explain the breathing. I still don't know what it could be. There's simply no logical explanation.
What do you think it could be?