I'll give you a question, please answer with step-by-step reasoning process. If you are awaking multiple times throughout the night because a lot is on your mind, what is a likely cause?\nOptions:\n- irritability\n- depression\n- getting out of bed\n- happiness\n- discomfort

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Depression is an illness of intense sadness. Having a lot in mind and not letting one to sleep is likely caused by sadness.
The answer: depression.
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