Can one escape rationality?

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Can one escape RATIONALITY? Man, like a few other animals, is endowed with the capacity of reasoning... By *reasoning*, we mean the process by which means are intentionally mobilized for the achievement of certain ends - no matter how much concerned with *efficiency* the actor is/ought to be. Well... If RATIONALITY (the process) is a human biological attribute, how would a sane and sound human being escape it? Asleep? Drunk? High? That is, unconscious? Consciousness implies rationality? Or not? Think of it, guys.