I've not taken it, but I've had it in the back of my mind for a while. It's definitely no coincidence, magnesium is a NMDA antagonist and zinc is a dopamine reuptake inhibitor, which means it increases dopaminergic activity, which would increase focus and awareness but zinc isn't enough of a stimulant to keep you awake so that'll likely just carry over into dreams. In addition, you don't dream if the dopaminergic pathways in your brain don't activate, they seem to be pretty directly connected. The NMDA antagonist effects of the magnesium also increase the dissociation of things like sleep paralysis (i.e., keeps you asleep better) and upregulates D2, the main hallucinogenic dopamine receptor which is likely one of the largest parts of dreaming in the dopaminergic pathways.
Be sure to post your results, I've been interested in this one for a while.

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