- The prefrontal cortex, the place in the brain that controls decision-making and problem-solving, is the first to suffer from not enough sleep. It causes you to be more irritable, moody and irrational.
- Sleeping less than six hours a night increases the risk of depression, psychosis, and stroke.
- Lack of sleep is tied to obesity. The stomach and other organs overproduce ghrelin, the hunger hormone, which causes overeating.
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