That's not true. Yes, some people die in their sleep, whether by disease, murder, or something else, but no one has ever died from sleep itself.
You aren't symmetrical. You. Aren't. Symmetrical.
YOU! AREN'T! SYMMETRICAL!?!?!?!?!?!
DDDDDDDDIIIIIIIIIIIIIIIEEEEEEEEEEE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!