I used to see geometric shapes upon waking up if I woke up abruptly in the middle of a very visual dream, but only if the first thing I saw was a sudden bright light (as in having my sleep mask abruptly removed). Hasn't happened to me in a while, but usually the bright light of the real world looks "pixelated" in very weird geometric patterns that for me were morphing, chromatically abberated and animated. These flashes of shapes only lasted 1 second at most but were very trippy to experience.
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