Paranormal activity?

I don't really believe in ghosts or things like that, so when talking about the paranormal or when something weird happens to me I try to think logically before jumping to conclusions. However, a few years ago I had an experience that, to this day, I still can't explain it.

It occured at night, 3am i think, I was in bed but I couldn't sleep so i was playing games in my cellphone when suddenly i heard noises coming from the livingroom, wich is very close to my own room. At first I didn't pay attention but the noises were more frequent and louder, even my dog, who sleeps with me, was alert. I came closer to my room door to hear better and I would describe the sound as like someone intentionally hitting the coffee table with their fist, something very different to the natural sound that wood sometimes make.
Then, i heard something strumming the guitar that my dad hanged on the living room and i completely froze in fear, I couldn't move and my dog started growling at the door. 

After almost half an hour of just listening i decided to go see what was  happening and i didn't see anything, the windows were closed and secured so it couldn´t be the wind, a cat or a rat that were making those noises, and just like that, it stopped. I decided to go back to bed after checking everything was ok. I was awake for the rest of the night with the lights on. 

I wonder what it could've been...