The lightening is always a good omen for the dreamer. This kind of dream shows the peacefulness and tranquility the one has found in his waking life. Perhaps the dreamer is in very deep connection with his spirituality. He asks the questions that not many people are asking. The dreamer knows that the living is something more than only the living we have every day. The goodness and tranquility that is within his mind is also coming in his dreams, which shows the amazing self-control one has achieved.
Read more about dreaming of Lightening in other dream meanings interpretations.