Ghosts in the Machines

Last night, while struggling to fall asleep, with a fan and an air conditioner thrumming, I thought I heard voices outside, or maybe instrumental music, or singing. Just barely.

Then, upon leaving the room, going to a non-AC portion of the house, I couldn't hear the voices, music, or singing.

Help me out here.

Was it a psychotic fugue (to use musical nomenclature)?

My imagination?

Or...

Or...was it one of those deals where the AC window unit somehow acts like a radio receiver, the way they used to say someone's braces or dental fillings could work like a radio?

People have really claimed that, and I guess it's true.

Just thought I'd ask.