N1-N4 Variations (vocal documentation from all four sleep stages)
N1: Loss of some conscious awareness of the external environment and muscle tone.
N2: Conscious awareness of the external environment completely disappears.
N3: The stage in which night terrors, bedwetting, sleepwalking and sleep-talking occur.
N4: A deeper version of N3, in which the deep-sleep characteristics are pronounced.
(NOTE: THIS CD IS 85% UNCONSCIOUS SPOKEN WORD)