I am confused about certain things, I really hope some kind person can help

What is the view of Buddhism on time and space does it exist?? In Advaita they say time and space do not exist at all. Advaita says that there is only the universal conciousness and all the objects and people are ilusions what is the Buddhist view here?. Advaita says that in deep sleep conciousness do not stop what is the buddhist view here?. In Advaita in order to experience our true nature we have to relax our attention from objects and let conciousness be aware of itself. What is the Buddhist view here does Buddhism say that conciousness being aware of itself is our true nature if not how do we experience our true nature similarly to the way advaita vedanta showed us to do and how do buddhist explain that experience of our true nature. Advaita Vedanta says that the world made out of matter in the waking state that we experience is in reality conciousness. They use the analogy of the dream where it seems that matter exists for us in the dream when we wake up we realize everything was conciousness. What is the view of Buddhism here? What is the difference between the nature of Brahman and Nirvana?. What is the difference between Nirvana and Samsara I read that they are the same? Which impliyes that Buddhism agree with advaita vedanta that we are in fact our true nature all the time and we have are just in a ilusion that we are not. Hopefully someone will be able to answer my questions I would really be thankful. Thank you for Everything. Kind Regards