In general: To plays in a dream day as well as night a role, this refers to the cycle of the changes which must take place without fail. An instruction to a matter or an aspect which must be planned timewise is sometimes given by such a dream. Psychologically: Often a dream wants to draw the attention to two contradicting states. The difference between day and night serves as a symbol for this purpose. Spiritually: At the spiritual level day and night in the dream is a very expressive symbol for contrasts which form together still a unity and are to be separated not of each other.