Sleep researchers, however, aren’t clear on the exact reason why humans even need to sleep. From an evolutionary perspective sleep would certainly have left primitive humans vulnerable to attack so it must offer some great advantage. Generally speaking, sleep is thought to allow our brains and our bodies to heal and repair from the damage of the day; synaptic plasticity is managed, brain pathways that are not being used are pruned, muscles are repaired, and energy stores are replenished.

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