The Dimension Called The Dream.

A dream has to have a trigger from the real world. 

The trigger too has to have an agent from present. Dreams from such triggers leave no trace when I wake up. The agent could be from a recent past, but that past too has to have some recurrence in present or some emotion of future. There is nature of the dream that tells it's a dream to me while dreaming and these are dreams that are common place, that don't remember or need to be remembered when I wake up. 

Then comes a dream, that lingers on for some time after waking up, it takes some time to brush it aside because the agents that triggered it come slowly to mind, the mind thus indulges in some limbo before it can wake itself to the daily grind of waking state in real world.

Then out of nowhere a dream hits you, it comes and engulfs you, it grips you as if that when you wake up it takes a lot of time to regain senses and still its losing continuity with opening of eyes is not considered by the mind. The mind cannot or refuses to give you the agent that triggered that dream, but this line of thought starts much much later. Till that questioning hits you, there are series of emotions that have to be dealt with. Emotions that stain each action that you want to engage in your real world. The grip on reality seems lost and I am at loss as to how to exactly put it in words. 

Dreams for one which makes us realize about dimensions, how many are there in real world and how many can be in dreams are what we indulge in. I don't want to get into the scientific explanation or mystical explanation of dreams here.

But when a dream whose triggering agent is in past or a future (one says future, only after the mind gives up trying to recollect the past from where the trigger could've come from) hits us, we realize that they (dreams) could be itself a Dimension that has triggered the evolution to take such a course. (The concept of evolution I think is a paradox as I am free to choose to dream and build a dream.)