I was falling asleep and was in that state of nothingness, I didn't know I was there, but I wasn't asleep and then all of a sudden, I slowly start to get awareness back and then start to see lines of colours and a sound getting louder and at the time I thought "shit I might be having an OBE" so I just tried to lay there and observe what was going on but it faded
what actually happened?

(sorry, it's hard to explain and happened a few days ago)