Why is there a time lag from astral travel to the time when you gain insight, wisdom, and understanding? 

You obtain information on the astral level much like a computer does – in large batches very quickly; mostly-raw data. It takes a period of time for the mind to first comprehend and then visualize this data, for as the energy body receives it, there is no visualization that accompanies it. Simply, the way knowledge is passed by is the knowing process. You simply know the information without experiencing or visualizing it. The mental mind, however, cannot put this to use unless it places some reference to it in the physical plane. So, it creates visualizations and experiences that allow the information to become useful. This is why there is a time lag.

I t may become possible that the understanding of the information can be instantaneous with much experience, or if the astral travel experience was uniquely strong or unusual. If the mind is accepting of the situation, it is able to visualize and experience the data. If travel was unexpected, or you were unprepared for it the mind may simply ignore the experience or may create some story to try to understand it, which may be a complete fabrication. In other words, you travel and create visualization, which is useful.

Your dreams will broaden as your astral travel experience increases. New insights and wisdom and understanding of past and future will increase through your dreams. The mental mind accepts information; especially details better in this fashion.