#1. Your sleep has poor quality
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During night time, the stress hormone cortisol is supposed to go down to the minimum levels. This will allow your system to slow down, rest, and recharge. Insomnia patients can’t sleep at night due to cortisol levels that are abnormally revved up after sun down. This can result from too many fight-or-flight stress responses in your body. When your body’s stress response is on, your body’s natural self-repair mechanisms are turned off. That’s why you get sick.