Tradução de frase "He believes that shows sleep"

olá

alguém será capaz de me traduzir as seguintes frases?

He believes that shows sleep evolved to conserve energy

'It's animals that are needlessly active that will not survive, but animals that are most efficient and use their waking time to do vital functions, and are otherwise asleep that will survive.'

In humans, when we're awake, our brain accounts for 20% of the energy we use when just sitting around

cumprimentos

jd