Testing Individual Effectiveness. Immediately after waking from sleep, remain motionless, eyes closed. Try to listen to noise in your head. Do this for 3 to 5 seconds without moving and without opening the eyes. If nothing happens during this period of time, switch to another technique. If any sounds like buzzing, humming, raving, hissing, whistling, tinkling, or melodies occur, listen attentively. With results, the sound will increase in volume. Listen in as long as there is some dynamism in the volume of the sound. When the sound stops, or the noise becomes loud enough, a separation technique may be attempted. Sometimes, the noise itself throws one into lucid dreaming while listening. At a certain stage, sounds may be extremely loud and have even been described as comparable to the roar of a jet-engine.
The action of listening in consists of actively and attentively exploring a sound, the whole of its tonality and range, and how it reacts to the listener.
There is an optional technique known as forced listening in, where it is simply necessary to strongly want to hear noise, and meanwhile make intuitive internal efforts, which, as a rule, are correct. Performed correctly, forced sounds will intensify the same way as those perceived with the standard listening in technique.
Training. In order to practice listening in, lie down in a silent place, eyes closed, and listen for sounds originating in the head. These attempts are usually crowned with success within several minutes of trying, and one starts to hear that noise that absolutely everyone has within. One simply has to know how to tune in to it.