In general: Visions can evaporate incredibly quickly on waking. The reason for this lies in the fact that the dreams could settle not yet in the consciousness of the dreaming. Dream work can help the dreaming, nevertheless 'to fix' the information of which his subconsciousness tries to inform him. Disappearance often registers that one would like to edge out disagreeable experiences quickly. Further intentions, experiences and hopes can be expressed in it which one must give up because they cannot be realised. Psychologically: How a child takes at face value magic, the dreaming also experiences the dream state as absolutely real. If pictures disappear in a dream suddenly, they become handier sometimes with waking again. Spiritually: The human mind owns big magic abilities what is expressed in the dreams in which things disappear and appear then maybe again. Popular: (arab).: Your conscience is not pure. (ind).: you is robbed.