The weird things have started to happen again. Things have been quiet here since March.  Last night my fiance and I were watching television and right at the good part at the end, the television turned off by itself.  It is plugged into a power strip and all the other thing plugged into the same power strip did NOT turn off, just the television.  A few minutes later, my room mate's son was in another room on the computer.  We have a dimmer switch for the light in there and he said that the light dimmed really low and then turned back up again.  Then tonight, my dog (who NEVER) barks was in the back room and started looking in to the closet and hallway barking and growling.  My room mate lives in that room and he said for about 10 minutes the dog just kept shaking and looking in the closet and the hallway and there was nothing there.

Maybe you have a spirit in the house.

Time for a house cleaning/clearing of spirit presence.

That would be my thought too, animals alot of times sense spirits even if we do not, young children can too alot of times.

You said it has been quiet for awhile, did something happen recently differently that may have caused the spirit to perhaps become irritated? This could be remodeling, repainting. It was in your roommate's room from the sound of it, is this a new roommate? Perhaps the roommate has done something different that the spirit didn't like. Is your home older? If so, you could maybe find out if anyone has died in the house, and if so, who. If it was a female, maybe she doesn't like that there is a guy in her old room or something. And you said that it started again meaning it happened before and stopped. What happened around the time it stopped before? Any number of things could be the reason it has begun acting up again, so look at everything that has changed.

Have you tried talking to the spirit? I know this sounds weird, but you could always ask it to leave. Explain to it that this is your home now and that it is disturbing you. You could also try asking it things while having a cassette recorder running to pick up any EVP's. Sometimes they will talk back to you. If simply telling the spirit that this is your home and you wish it to leave doesn't work, you could always get some sage and smudge the house with it, concentrating on the room its been in most. Or if you aren't into things quite so NewAge, you could also go to a local church and get some holy water and walk through your home sprinkling the holy water while holding a bible or cross and reciting the lord's prayer. My friend did this after a rather scary spirit followed her home from a ghost hunting trip.

Must admit things like this happen to me all the time wherever I go lol, but I would pay attention to the dog, they can really sense whatis going on otherwise it may be circuit surges and faulty remotes or even someone leaning on one, or being the end of a power cable. But animals don't invent things, and they do sense far more than we so my guess is that the dog saw an energy source