odd occurrence at 1:12am..

As I was trying to fall asleep I looked at my clock and it so happened to be 1:23..as I tried to sleep I noticed that the normal ringing sound I hear when its deathly silent, you know what feint ring im talking about, changed. It s now definitely a higher frequency and when I focused on it and tried to feel it out my brain was flooded with vivid images and I almost felt as though I was on drugs it was so euphoric. It seemed like i was traveling the world at a high speed of my own free will soaring over mountain tops and oceans..truely an amazing experience..