I take Magnesium an hour or so before bed and boy does my Mi Band smartwatch show a difference in deep sleep those days. Is it "real" improved deep sleep? No i

I take Magnesium an hour or so before bed and boy does my Mi Band smartwatch show a difference in deep sleep those days. Is it "real" improved deep sleep? No idea. I do blood tests for Magnesium (and D3, B12, etc) every so often to make sure I'm not poisoning myself.