Multiple dimensions? (not the mathematical kind)

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So, for med school I’ve been reading a couple books of trauma cases and I stumbled upon a story, case in which there’s a guy who was in a car crash, he was unconscious for a brief moment but then he later narrates how for him the experience was a full decade, in which he met a girl, fell in love, got married, had kids and later noticed something weird in that “reality” a lamp wasn’t right, even tho the wife said it was nothing he suddenly woke up, in scene, with a lot of pain, a few minutes after the crash...
For him a full decade passed, what do you think? What causes this, could it be possible that somehow, the incident connected two dimensions? I know there’s a psychological answer and still, it kinda bugs me, could it be possible?