I'll have these strange stages during the dark winter season. One day i'll feel great, seeing beauty in everything, feeling ambitious, setting goals, etc... The next day i'll feel absolute pointlessness. Nothing will seem worth living for. I'll feel alone. My motivation will be rock bottom and it will actually be many times harder than usual keeping my job. I'm not coming on here for medical help dont worry.. i posted in this forum for a reason. I'm curious as to our rapidly changing body chemistry and how it fits into evolution. It's really not in our best interest to be depressed. Its not productive at all, and some people even lose the ambition to procreate. Is this a contradiction of our basic need to survive? I don't see any benefits..