there is a difference between space and time like if I am in Tokyo in dreaming state and after waking I am in Kolkata then how do we connect between Tokyo and Kolkata in the same platform?
They are different, they are not related to actual events that happen or occur in certain places (Tokyo or/and Kolkata, for example), but relate to your brain activities or personal/psychological background.
But How do we connect the level of intensity between two stages? because both states give the same intensity that is why we are not using the word 'dreaming ' instead of 'seeing' in dreaming state.
Now, you talk about "intensity", which is both objective and subjective matter. People in Arab societies (Egypt, for example), use the word "see/ing" (ra’a or shāf) indicating actual seeing something in the dream (manām or ḥulm), but they are aware of the difference between real world and dreaming state of mind. The Arabi word "manām" is derived from the word "nawn" which means sleep/ing. They also use the word "vision" ( ru’yā ), which is sharper, stronger, more veracious, and higher in dignity than regular dreams. For more information, please see this: Article Dreams and the Construction of Reality Symbolic Transformati...
Yes.. from the perspective of waking state, someone can able to differentiate between waking and dreaming. but my question is about when someone in dreaming state then can we differentiate between two stat? At that time. it seems like a real (in sanskrit 'sat') but when comparison comes then it is not possible. it can be happened that right now we are not able to grasp that dreaming reality but we can't say that dreaming object is unreal because many time we got solutions from dreaming state. then how do we explain that state?
In Mandukya Upanisad( 2nd century), they proposed that world is an imagination and unreal because only real is Brahman and Brahman is ultimate happiness and true. Therefore, from the perspective of transcendental reality or Brahman , both waking and dreaming are unreal and same status.
Jayashanmugam, N. (2002). MĀṆḌŪKYA OR CATUṢPĀDĀTMA-SIDDHI. Annals of the Bhandarkar Oriental Research Institute, 83, 121-138. Retrieved from http://www.jstor.org/stable/41694714