I think nature's solution to this kind of inefficiency arises by adopting a new social behavior rather than evolving a new DNA-based physical ability. It's eas

I think nature's solution to this kind of inefficiency arises by adopting a new social behavior rather than evolving a new DNA-based physical ability. It's easier and faster for a group of animals to appoint a guard to protect others during sleep than for the species to evolve a superior brain.