Yea... me too. I think they're just dust particles creating a form of lens-flare. For anyone to say with certainty that they are anything different without a myriad of techno gadget proof is blowing smoke.
I have known very rational people who have witnessed actual 'hauntings'... and have seen UFO's. But that doesn't mean that they saw ghosts or flying saucers.
These people just saw or heard something they couldn't explain. One time I was fishing a remote pond at 6:00AM. I heard a noise that reminded me of a blow-torch or blast furnace moving towards me from behind a nearby hill. First thing that popped in my mind was... DRAGON! Yea, dragon.
My 'dragon' turned out to be a hot-air balloon!