To put a new-agey spin on your question about "why death dreams" I would suggest you dream it so you don't have to live it to ask yourselves the hard questions the dreams bring to you. You get to not die, yet still grow from the experience.
Of course, I'm sure Dr L has much better answers and its all drug related/physiology related. Way over my head.
Speaking of unmanageably over my head things, how about chemical oscillations? A chemical reaction might develop temporary, damped oscillations. Maybe that creates death and lust dreams. You might wear stripes in real life (tiger) but have spotted dreams (leopard).
And no, I have no idea what I'm talking about so don't ask.
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