To dream while sleeping that you are dancing means what?

Dance

To dream that you are dancing, signifies freedom from constraints and harmony/balance with yourself. You are working in cooperation with yourself. It also represents frivolity, happiness, gracefulness, sensuality and sexual desires. Alternatively, it may signify intimacy and a union of the masculine and feminine aspects of yourself.

To dream that you are attending or going to a dance, indicates a celebration and your attempts to achieve happiness. Consider the phrase the "dance of life" which suggests creation, ecstasy, and going with what life has to offer you.

To see children dancing in your dream, signifies that you will have a comfortable home, and healthy, well-behaved children in the future.

To see ritualistic dancing in your dream, denotes your need to get in touch with the spirit within..

http://www.dreammoods.com/dreamdictionary/d.htm

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Once again, depends on which dream interpreter you believe. Some say a dream is an indication of something about to happen that is what you were dreaming. Others say exactly the opposite. You pays your money and takes your choice...