It happens mainly when I am relaxed, about to sleep or near to wake up, but it also happens other times but less often, generally on quiet environments, then I start to listen a music on my head, most of the times it is a song I know, but it also happens to listen a unknown melody, maybe it is a composition of several songs I have listened before mixed together within something pleasurable but new for me.
The song is played so sharp it seems to be going from my ears, the bass are so loud it shivers my body, and it seems I have no control about what is being played, sometimes it is played different songs one after another.
When it have vocals I listen the original singer voice, even on songs I have never memorized the lyrics, and I also happen to listen some Japanese songs out of this state, and sometimes this phenomenon happens to play Japanese music that I would never be able to sing, but not only the melody but also the lyrics seems to be correct on the original idiom.
I want to know if there are more people had already gone through this phenomenon and if it has name?