My wife and I bought this house we are in now 4 years ago. In these last 4 years, I have seen three BRIGHT blue "flashes" of light that all came from the master bathroom to the left side of the bed-room. It was super dark late at night, and I just happened to be awake at the moment, and opened my eyes at the right time to see it. It was super bright and bathed the whole room in blue light for just an instant. I could see the source if the light, it was just a tiny pin-hole as if a single photon exploded at random. It was about 6 inches up from the floor and in the doorway of the bathroom. My wife has seen one or two as well.
I had kind of forgotten about it, but yesterday in the afternoon, my wife and I both saw it again at the same time but this time in the bright light of afternoon sunlight coming in through the closed blinds of out bedroom. It was in a different spot this time, it was in the middle of the room, in front of the window, but even then, it was so bright that it stood out against the sunlight coming in through the closed blinds. I thought that I was the only one seeing it, but then she asked me if I had seen it, and of course I said yes.
Well then about an hour later, she saw another one in the kitchen. So this has now gotten to the point that it has prompted me to get online and try to find more info on the phenomena. I am curious.
Another thing, similar and maybe related, I sleep with my cell phone on the night stand beside the bed, it is used as an alarm. But one night, after the first sighting, the light on the screen came on. No phone call, no message, no sound came from it. It just lit up for like 30 seconds. My wife & I were still awake, laying there talking about things like this, spirit visitations, ghosts etc. So then the phone lit up and freaked us out! I jumped up and was looking at it trying to see if there was some message on it or not, and it was just white light, a blank screen.