I used to have that when I was a kid. Now I just hear people. But it's usually people I know. It appears to be some sort of ESP. For example, last week I heard the voice of somebody I know calling me downstairs in my house. I looked at the time an it was 7.19 AM. I shouted back downstairs to them, but there was nobody there. The next day the persons voice who I had heard, came to my house. I told them about what had happened. They said that at around 5.20 AM they were considering walking to my house. The time it would take them to get to my house would have been around two hours. So at the time I heard their voice. Had they actually have walked to my house, that would have been about the time they arrived.