Hello, This happened to me a long long time ago, when I was kid & I'm wondering if someone has any idea what it could be... When I was in bed, trying to sleep at night, but couldn't, I was hearing weird chanting like songs performing by multiple voices. Those were happening in 90's, where usually we didn't even have electricity and where using candles. Typically it was happening at night, maybe at 3AM or even later 5-6AM, I don't remember. We were living in apartment, on 5th floor and there is no chance some other people would sing/chant at those time. I think it was in my head, but I can't explain this. Oh and they weren't using words, there were only tones. I don't know how to explain better. I don't remember how many times it happened, probably not many. Has anyone else encountered such thing before?