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When we discussed why we throw up when we feel a non-localized interruption of our corollary discharge, I started thinking about how ridiculous it is. I mean, the notion that our body's raction to unknown stress is sleep made me laugh. I had never thought about it like that before. I wonder, though, if it is the same with depression. One of the main symptoms of depression is an increase or disruption of sleep activities. Is it possible that the stress of the chemical imbalance or situation that provokes depressive episodes interferes with our corollary discharge in a way that parallels non-localized stress such as motion sickness? Do mental inputs have the same kind of painful effect on the body as physical ones?