So, I have been experiencing this pattern, for several weeks now, in which I feel pretty normal during the day - but when night comes my mind just goes ballistic.

Typically I just hear thought echos all night, until I fall asleep.  Last night was different, though, in that I heard an alien-like voice tell me that my freezer was on, which makes absolutely no sense.  After that, I noticed that there's a monologue transpiring within my head that is independent from my thinking voice.  

None of the above is terribly scary (it's more annoying), but it is shocking how I'm so "normal" during the day, relative to at night.  Anyone have experience with this?