Weirdness Magnet

So, this has happened a few times. I will be sitting at home, quite alone, when it is very quiet, when I will hear, soft and muted, a conversation or a single voice speaking. It always happens in the upstairs bedroom, almost always very late at night, or early in the morning. It seems to come from the general area where the outside wall meets the closet. I have not been able to make out the words when it is a conversation, although once when it was a single voice, I thought that I heard it say my name: Cat.

I have considered the possibility that it is someone outside, although upon further investigation, I have discovered no one outside when it occurs. I have also considered the possibility of it being my neighbors who could possibly be speaking very loudly and in different-sounding voices, I suppose, except for the fact that it usually happens when all the lights are out over there, or no one is home.

I have also considered the possibility that the computer speaker is somehow picking up some sort of cell phone or radio transmission, very faintly.

In any case, it is an interesting phenomenon for which I have no real explanation.