Okay so I think something might be living in my house.We have this huge storage cupboard,

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Okay so I think something might be living in my house.
We have this huge storage cupboard, and there is a light at the back. Only it never works, it's constantly pitch black and freezing in there despite all the electronics working and it being insulated. Recently my parents went away for two weeks leaving just me and the dog in the house. The dog has been barking at this one corner down in the living room every night for about 3 hours at a time. Not only does the noise drive me up the fucking wall but it makes me paranoid. I moved to this house when I was 15 and in the 4 years I've lived here I've witnessed a few minor "paranormal" incidents. I've seen stuff move when it's not meant to. I watched a gnome my grandma gave me that I keep on my desk turn around at 3 in the morning once. Only turned a few centimetres but it definitely moved. At one point last year I swear something pulled the back of my shirt up when i was sitting in my desk. And just before my parents left, my grandmother's old music box which hasn't worked in years suddenly started playing on it's own. It works fine now despite being broken for years. Since there's nobody but me around I think it's starting to get a bit more active. I dunno what it wants but I don't think it wants to hurt me or my dog, since it's had plenty of opportunities over the 4 years we've lived here but hasn't taken any.
Any idea what it could be? I'm not too educated on the paranormal, although it really interests me.