It's almost like some people have brains that are set to hibernate, like bears.
How It May Have Helped Humanity:
Oh, right. It may actually have been a form of hibernation.
Ask your doctor if Torporine is right for you. May cause drowsiness.
There is a theory that the brains of our northern ancestors devised a way to oscillate their moods between manic and depressive to align the former with light, warm seasons and the latter with the cold darkness of winter. This would be for the exact same reasons lots of animals do it: The manic episodes turned them into superhunters and uber-gatherers who happily slaughtered and stockpiled while the sun was shining, right up until it was time to sink into wintery depression.
According to this theory, people with bipolar disorder were also masters of boning. Since bipolar disorder is most prevalent in women of reproductive age, some researchers think part of the reason the brains of prehistoric ladies dug bipolarity was sheer procreation: They turned on the manic phase during the summer, when it was most convenient to get pregnant. The subsequent winter down period would have ensured that the lady is less active and free to concentrate on the coming child, which in turn would have led to healthier offspring.
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We imagine that's it's a rather nasty shock to suddenly wake up with a several-month-old infant latched onto you.