If we didn't need sleep, life on earth would be a lot different. We would get more things done, and scientists would have more time to create new inventions. Kids in school wouldn't be as tired and they can get better educated. The world would evolve but it also could hurt some species of animals such as nocturnal animals, it would stress them out a little because at night it wouldn't be as peaceful as they are used to. Yes, it is a good thing that humans can evolve, but sleep does feel good sometimes.
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