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You stay awake for 72 hours without any sleep at all At first, you think you'll just feel tired and slow But after 24 hours, your brain starts losing focus completely Your reaction time drops, similar to being legally drunk By 36 hours, your body struggles to regulate temperature properly Hallucinations begin, and you may see or hear unreal things Your immune system weakens, making your body more vulnerable At 48 hours, memory and decision-making become dangerously impaired By 72 hours,