Metus comments on Depression's evolutionary roots - Less Wrong Discussion
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So how does suicidal ideaton fit with this? Is the benefit of hibernation that much higher than the probability of killing oneself? Also why does being depressed feel miserable then, sleeping for example is a very enjoyable experience, at least for me.
Side effects: Our brains are machines that sometimes have very crude control mechanisms. Floods of certain neurotransmitters to enrage us, others to make us feel love and lust. The sort of chemical conditions necessary to encourage torpor and cautious behavior also make us "sad".