What is happening while We SLEEP?

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Here are very few extracts about Sleep when I tried to read about sleep: We nearly spend one third of lives in sleep. While we are awake, the energy of the brain is in motion to all our parts of the body. During sleep, the drained energy are refreshed and get rehydrated. It refresh the mind. Since the brain never rest, while we keep our body still and mind in another activity other than the action we are doing say dreaming, the brain get cleaned by the blood circulation and get refreshed.