Are you asking how or why? If it's the latter, one thought is there doesn't need to be any grand design, but merely that consciousness gives some sort of evolut

Are you asking how or why? If it's the latter, one thought is there doesn't need to be any grand design, but merely that consciousness gives some sort of evolutionary advantage. It reminds me of Matthew Walker's potential hypothesis that sleep is our default state. So why would wakefulness exist? Conceivably because it confers some evolutionary advantage. Consciousness is sometimes referred to in the same terms of "wakefulness"