He describes his findings in his book titled Lifetimes. Dr. Lenz found that most spontaneous past-life memories came back as dreams, or while the person was meditating, as a waking vision, or from experiences with déjà vu. Dr. Lenz found that immediately before a spontaneous past-life recall these people would feel that they were becoming lighter and bright colors would flicker in front of their eyes. They would experience a euphoric feeling of well-being and the room would appear to vibrate. Then they would suddenly be transported back to a past life for a few moments. Often they appeared slightly dazed once the experience was over.