“I think intermittent stressful events are probably what keeps the brain more alert, and you perform better when you are alert,” Kirby says. For animals, intermittent stress is the bulk of what they experience, in the form of physical threats in their immediate environment. Long ago, this was also the case for humans. As the human brain evolved and increased in complexity, we’ve developed the ability to worry and perseverate on events, which creates frequent experiences of prolonged stress.

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via How Successful People Stay Calm – Early To Rise.