Going to sleep had two fases. First your body makes a chemical indicating you are going to sleep. It makes you more relaxed and it starts the production of another chemical that will cause the actual sleeping. If you stress, the first chemical won’t be produced. That’s because if you are stressed your body must be ready to fight off that lion or other danger. The second chemical needs you to be relaxed enough and don’t have to much brain activity in your prefrontal cortex.
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