As the navel of the world, this is a universal cosmic symbol. As a symbol, it embodies the center; the center of the body of mother earth. In this way, a navel in a dram often indicates a mother complex.  If young women dream of navels, this frequently indicates latent lesbian tendencies.

When the setting in a dream is night, this signifies a spiritual area about which we are, so to speak, still in the dark.

It is only in extremely rare cases that nudity in a dream refers to an erotic situation.  Nudity indicates a state of spiritual exposure.

According to the teachings of Jung, numbers were not consciously invented, but are spontaneous products of the unconscious.  As such, they are archetypal symbols.  Modern science expresses all aspects of living things in terms of mathematical formulas.  In  other words, science relates material processes to numbers.  Study of dreams has shown that similar relationships exist between psychic functions anc certain numerical relationships.
In dreams, the number two usually has female significance.  It is the number of union and of the couple.  On the other hand, it indicates the opposition of man and woman, matter and intellect, heaven and earth, etc.
Three is an age-old magic number.  Even today, a word is frequently repeated three times to give it particular significance. It is still customary to knock on wood three times to avert disaster.
Seven is a dynamic number.  The week has seven days, the rainbow has seven colors and the lunar cycle is 28 days (or four times seven). The esoteric explanation of the significance of the number seven is that it is formed by adding four, the symbol of totality, to three, the symbol of creative intellectual powers.
An eight in a dream, or octagonal forms or rooms can have an extremely positive significance.  A state of completeness is indicated.
On the other hand, if further developments in the dream so dictate, the eight ( as a symbol of totality and completeness) can indicate that no further possibilities exist in a certain situation.  In this respect, the eight can sometimes have the significance of a warning signal.
We are used to calculating in the decimal system.  Eleven starts a new series.  In dream symbolism, it indicates new occurrences or progress.
Thirteen has a similar significance.