my ex girlfriend is a psych major and we talked about this. her professor claimed that it is an ingrained reflex from when we were still tree-dwellers.
monkeys which didn't have the reflex to wake up like that would fall from the trees and die. (darwinism)
i'm not saying whether or not i believe it, because it seems kind of strange taht that reflex would be kicking in when you're in bed...
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In the end we are but wisps
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