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 Everything originates from something that is eternal because things cannot come from nothing.

If ever nothing were to have existed in the past, there would only ever be nothing. Since there is not nothing something must have always existed. That something is the origin of everything else that exists.

Either awareness is real, or it’s an illusion. If it’s real then it originates from whatever is eternal. If it’s an illusion there’s no point in discussing it.

So any discussion of awareness as a real phenomenon hinges on the ‘something that is the origin of everything else’ being aware. That ‘something……’ is more conveniently called the Absolute Truth. Srimad Bhagavatam is an 18,000 verse book, which identifies Sri Krishna as the Absolute Truth in the first text and then expands on that for the rest of the book.

SB 1.1.1 - O my Lord, Sri Krishna, son of Vasudeva, O all-pervading Personality of Godhead, I offer my respectful obeisances unto You. I meditate upon Lord Sri Krishna because He is the Absolute Truth and the primeval cause of all causes of the creation, sustenance and destruction of the manifested universes. He is directly and indirectly conscious of all manifestations, and He is independent because there is no other cause beyond Him.

Short version: Awareness exists because Krishna is aware.