Controlled scientific tests might, conceivably, show this to be related to fatigue - a fatigued person would succumb to alchohol and pass out before arriving at the blind drunk stage. On the other hand, such tests might also draw a connection between alcohol tolerance and the ability to become incoherent and visually impaired without first becoming unconscious. Consequently, blind drunkeness might be a state reserved for those who are well-rested, or it might be a state related to alcohol tolerance.
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