https://www.bustle.com/wellness/things-your-brain-is-trying-to-tell-you-when-you-experience-deja-vu-8334677

https://mosaicscience.com/story/my-deja-vu-so-extreme-i-cant-tell-whats-real-any-more/

Article touching on ideas of Dr. Michael Newton:

https://foreverconscious.com/spiritual-meaning-of-deja-vu