The feeling of deja vu feels to me like the remembrance of a dream, when in fact it’s essentially a delayed-feedback loop of what’s happening right now. When I have deja vu, that deja vu can last for minutes and often makes me wonder "did I dream this?" until I realize I can’t place the night in which I had the dream. I never think "this happened to me already," in the same way most people describe deja vu.
I think you’re just, as you already mentioned, experiencing deja vu. Try documenting your dreams in detail: chances are, when you experience this feeling of premonition, you’ll find that the dreams you’ve documented never actually occur in the real world.
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