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Sleep is the natural state of life, it uses far less energy and we only wake up as a means to procure more energy. On a planet where plants have a constant source of energy to grow the animals may sleep more.

Sleep is the natural state of life on this planet. Other planets may have evolved different biology where the concept of sleep is unknown, unneeded or impossible.

Your metabolism does not slow down while sleeping so it does not really save that much energy.

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