The Head Patting Ghost

I've been reading this website for a few days now, but this is the first time I post an experience. This experience is not completely mine, as it actually happened to my mother. I'm just sharing both her side and mine of the story. Also, I apologize for any mistake I could make while writing this, English not being my first language and all.

I live with my family in a two story house. There are two bedrooms upstairs (mine and my parents) and one downstairs, which we use as a guestroom. The other night my mother couldn't sleep (my dad snores reeeaaally loud), so she went to the guestroom to spend the night. At that moment I happened to be in the living room, on my laptop, doing whatever, and she just told me half asleep what had happened. I just nodded and continued doing whatever I was doing. A few minutes passed and I heard some steps going upstairs, and I just assumed it was my mother going back to her bedroom. I didn't give it much thought and went to bed soon after.

Next morning, my mother asked me if I had been to the guestroom and gently patted her head. I said no. She then told me that someone had opened the door, walked to her (she heard the footsteps) and proceeded to, well, pat her head, then walked away and left the door half open. She thought it had been me. As it happens, my mother had spent the whole night in the guest room and my dad was sleeping upstairs, so whomever I heard going upstairs that night was definitely a strange presence.

A few months passed, and my mom had the same problem with the snoring, so she went downstairs to spend the night again, only this time she went to the living room and slept on the couch. Next morning, she asked me if I had come downstairs and covered her with a blanket and, again, patted her head, which wasn't the case. She had half-woken up in the middle of the night feeling cold, and felt a presence covering her with some sort of invisible blanket (there was nothing really there) and patting.

Now, neither she nor I have the least idea of who this presence could be, but we're trying to convince ourselves that it's a good spirit who's looking after her. At least we hope so.