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why when we do dream we do see/experience things?

if it is true (i personally have never heard of anything like that-do you have any links to such publications available??) that when an individual which is going to die it is seeing blue light then i personally would think it is because the brain is loosing bit after bit it concious connections to its environment - maybe the brain is also capable of sensing (in virtual pictures) somehow and mostly unconcious different wave lengths (something like cosmic rays and beyond?) besides the visible light (reality) - and so you just don't dream while you die because your brain isn't working properly anymore but just see kind of light .... meaning you still sense but not process information ...